Device to Overcome Sense of Sight and Hear Free Essays

string(63) " production of highly regarded binoculars, with a few changes\." SENSE OF SIGHT†¦. The eyes are sensory organs. They keep the brain updated with information about is what happening around the body. We will write a custom essay sample on Device to Overcome Sense of Sight and Hear or any similar topic only for you Order Now Both contain millions of tiny sensors that send messages along nerves to the brain. Sensors in the eyes respond to light and, through the brain, let us see the world. Sensors in the skin respond to touch and allows us to feel. * * * * The seeing eye†¦ Light enters the eye through the clear cornea. It then passes through the pupil and is focused by the lens on the retina. This thin layer covers the back of the eye and contains cells that are sensitive to light. When light hits the cells, they send signals to the brain. There, the signals are turned into pictures so we can see. Telescope†¦ A  telescope  is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation  (such as  visible light). The first known practical telescopes were invented in the  Netherlands  at the beginning of the 17th century, using glass lenses. They found use in terrestrial applications and astronomy. Within a few decades, the  reflecting telescope  was invented, which used mirrors. In the 20th century many new types of telescopes were invented, including  radio telescopes  in the 1930s and  infrared telescopes  in the 1960s. The word  telescope  now refers to a wide range of instruments detecting different regions of the  electromagnetic spectrum, and in some cases other types of detectors. History†¦ The earliest recorded working telescopes were the  refracting telescopes  that appeared in the Netherlands  in 1608. Their development is credited to three individuals:  Hans Lippershey  and Zacharias Janssen, who were spectacle makers in Middelburg, and  Jacob Metius  of Alkmaar. 4]  Galileo  heard about the Dutch telescope in June 1609, built his own within a month,[5]  and greatly improved upon the design in the following year. The idea that the  objective, or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope. [6]  The potential advan tages of using  parabolic mirrors—reduction of  spherical aberration  and no  chromatic aberration—led to many proposed designs and several attempts to build  reflecting telescopes. 7]  In 1668,  Isaac Newton  built the first practical reflecting telescope, of a design which now bears his name, the  Newtonian reflector. The invention of the  achromatic lens  in 1733 partially corrected color aberrations present in the simple lens and enabled the construction of shorter, more functional refracting telescopes. Reflecting telescopes, though not limited by the color problems seen in refractors, were hampered by the use of fast tarnishing  speculum metal  mirrors employed during the 18th and early 19th century—a problem alleviated by the introduction of silver coated glass mirrors in 1857,[8]  and aluminized mirrors in 1932. 9]  The maximum physical size limit for refracting telescopes is about 1 meter (40  inches), dictating that the vast majority of large optical researching telescopes built since the turn of the 20th century have been reflectors. The largest reflecting telescopes currently have objectives larger than 10  m (33  feet). The 20th century also saw the development of telescopes that worked in a wide range of wavelengths from  radio  to  gamma-rays. The first purpose built radio telescope went into operation in 1937. Since then, a tremendous variety of complex astronomical instruments have been developed. How to use†¦ * Find an area where the items you wish to view aren’t obstructed by trees to set up your telescope so that you get a clear view of the sky. * Look to see if your telescope has a polar axis. If it does, it will track whatever you are looking at. If you have a telescope with a polar axis, follow your manufacturer’s directions on how to align the polar axis and the finder scope. * Select the eyepiece with the lowest magnification that you have. Always start with the lowest magnification eyepiece until you become more experienced in using your telescope. Locate the item in the night sky that you wish to observe and focus in on it. Move the planet or star you are viewing as close to the center of the field of view in the eyepiece as possible. * Remove the low magnification eyepiece and replace it with an eyepiece with a higher magnification. * Readjust the alignment of the telescope when the planet or star drifts out of view if you have a manual telescope mount. * Continue in this manner, observing different visible planets and stars. Binoculars †¦ Binoculars,  field glasses  or  binocular telescopes  are a pair of identical or mirror-symmetrical  telescopes  mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although sizes vary widely from  opera glasses  to large pedestal mounted military models. Many different abbreviations are used for binoculars, including  glasses, nocs ,noculars ,  binos  and  bins. Unlike a (monocular) telescope, binoculars give users a three-dimensional image: for nearer objects the two views, presented to ach of the viewer’s eyes from slightly different viewpoints, produce a merged view with an  impression of depth. History †¦ No sooner was the telescope invented in than the early 1600s than did astronomers get the idea of mounting two of them together, effectively inventing the first binoculars. Galileo (who is often falsely credited with having invented binoculars) adapted an earlier design, using optics that combined convex and concave lenses to create a magnifying effect just like that used today in the cheapest nonprismatic glasses marketed for sports or theater viewing, or for use by children. In the mid-1850s, Ignazio Porro of Italy patented a design using two prisms constructed in a Z shape to present the viewer with an image that not only is better magnified, but has depth. The Porro prism design was followed a few decades later by the roof prism, in which the prisms are constructed in one unit. Soon, binoculars were adapted for military use, and were employed during the Civil War. Quality made a big jump around the turn of the 19th century, and continued to be refined in the early 1900s. With the advent of World War II, more manufacturers entered the binoculars market, including, in the United States, Bausch ; Lomb. Germany continued with its production of highly regarded binoculars, with a few changes. You read "Device to Overcome Sense of Sight and Hear" in category "Essay examples" For example, Zeiss, one of the top names in binoculars, experienced a confusing shift, with a new factory established in East Germany under Russian control with the Zeiss name while another factory named Zeiss was began exporting from West Germany, according to a history in the 1961 book Binoculars and Scopes and Their Uses in Photography, by Robert J. and Elsa Reichert. Japan exports binoculars via various manufacturers, and some U. S. ompanies import Japanese-made binoculars but sell them under the U. S. company name. How to use†¦ * Put the binocular strap around your neck. Wearing the neck-strap gives you the ability to use both hands while you are using the binoculars. * Adjust the barrels of the binoculars — each side you look into — to the width of your face. Generally, all you need to do i s move the barrels closer together or further apart as you hold the binoculars up to your eyes. If you have adjusted the binoculars correctly, you should not see a black â€Å"border† when you look through the eyepieces. Locate the central focus wheel, usually in the middle of the two barrels of the binoculars. Turn the wheel slowly as you look at a particular object in the distance to get the best focus for your eyes. * Fine-tune your viewing even more if you have a diopter focus mechanism on your binoculars. Not all binoculars have this focus element, which helps compensate for the difference in vision that you might experience in each of your eyes. The diopter focus adjustment wheel is usually on the right-hand barrel. * Keep both eyes open as you view your target objects. You might need to re-focus from time to time. * Clean your binoculars after using them. A soft, damp cloth is sufficient for the body of the binoculars. Treated tissue paper used to clean cameras and eye glasses is safe for wiping the lenses. Store binoculars in their carrying case when you’re not using them. Microscope †¦ A  microscope  (from the  Ancient Greek:   ,  mikros, â€Å"small† and   ,  skopein, â€Å"to look† or â€Å"see†) is an  instrument  used to see objects that are too small for the naked eye. The science of investigating small objects using such an instrument is called  microscopy . Microscopic  means invisible to the eye unless aided by a microscope. There are many types of microscopes, the most common and first to be invented is theoptical microscope  which uses  light  to image the sample. Other major types of microscopes are the  electron microscope  (both the  transmission electron microscope  and the  scanning electron microscope) and the various types of  scanning probe microscope History †¦ The first microscope to be developed was the optical microscope, although the original inventor is not easy to identify. An early microscope was made in 1590 in  Middelburg, Netherlands. 1]  Two  eyeglass  makers are variously given credit:  Hans Lippershey   (who developed an early  telescope) and  Zacharias Janssen. Giovanni Faber  coined the namemicroscope   for  Galileo Galilei’s compound microscope in 1625  [2]  (Galileo had called it the â€Å"occhiolino† or â€Å"little eye†). How to useâ⠂¬ ¦. * When moving your microscope, always carry it with both hands (Figure 1, below). Grasp the arm with one hand and place the other hand under the base for support. * Turn the revolving nosepiece so that the lowest power objective lens is â€Å"clicked† into position (This is also the shortest objective lens). Your microscope slide should be prepared with a coverslip or cover glass over the specimen. This will help protect the objective lenses if they touch the slide. Place the microscope slide on the stage and fasten it with the stage clips. You can push down on the back end of the stage clip to open it. * Look at the objective lens and the stage from the side (Figure 2) and turn the coarse focus knob so that the objective lens moves downward (or the stage, if it moves, goes upward). Move it as far as it will go  without touching the slide! * 5. Now, look through the eyepiece and adjust the illuminator (or mirror) and diaphragm (Figure 3) for the greatest amount of light. | | | * Slowly turn the coarse adjustment so that the objective lens goes  up  (away from the slide). Continue until the image comes into focus. Use the fine adjustment, if available, for fine focusing. If you have a microscope with a moving stage, then turn the coarse knob so the stage moves downward or away from the objective lens. * Move the microscope slide around so that the image is in the center of the field of view and readjust the mirror, illuminator or diaphragm for the clearest image. Now, you should be able to change to the next objective lenses with only minimal use of the focusing adjustment. Use the fine adjustment, if available. If you cannot focus on your specimen, repeat steps 4 through 7 with the higher power objective lens in place. Do not allow the objective lens to touch the slide! * The proper way to use a monocular microscope is to look through the eyepiece with one eye and keep the other eye open (this helps avoid eye strain). If you have to close one eye when looking into the microscope, it’s ok. Remember, everything is upside down and backwards. When you move the slide to the right, the image goes to the left! * Do not touch the glass part of the lenses with your fingers. Use only special lens paper to clean the lenses. * When finished, raise the tube (or lower the stage), click the low power lens into position and remove the slide. * Always keep your microscope covered when not in use. Submarine†¦ A  submarine  is a  watercraft  capable of independent operation underwater. It differs from a  submersible, which has more limited underwater capability. The term submarine most commonly refers to a large crewed autonomous vessel. However, historically or colloquially, submarine can also refer to medium-sized or smaller vessels (midget submarines,  wet subs),  remotely operated vehiclesor  robots. The adjective  submarine, in terms such as  submarine cable, means â€Å"under the sea†. The noun  submarine  evolved as a shortened form of  submarine boat(and is often further shortened to  sub). [1]  For reasons of  naval traditionsubmarines are usually referred to as â€Å"boats† rather than as â€Å"ships†, regardless of their size. Although experimental submarines had been built before, submarine design took off during the 19th century, and they were adopted by several navies. Submarines were first widely used during  World War I  (1914–1918) and now figure in many large  navies. Military usage includes attacking enemy surface ships or submarines,  aircraft carrier  protection,  blockaderunning,  ballistic missile submarines  as part of a nuclear strike force,  reconnaissance, conventional land attack (for example using acruise missile), and covert insertion of  special forces. Civilian uses for submarines include  marine science, salvage, exploration and facility inspection/maintenance. Submarines can also be modified to perform more specialized functions such as search-and-rescue missions or  undersea cable  repair. Submarines are also used in tourism, and for  undersea archaeology. Most large submarines consist of a cylindrical body with hemispherical (and/or conical) ends and a vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes. In modern submarines this structure is the â€Å"sail† in American usage, and â€Å"fin† in European usage. A â€Å"conning tower† was a feature of earlier designs: a separate pressure hull above the main body of the boat that allowed the use of shorter periscopes. There is a propeller (or pump jet) at the rear and various hydrodynamic control fins as well as ballast tanks. Smaller, deep diving and specialty submarines may deviate significantly from this traditional layout. Submarines have one of the largest ranges of capabilities in any vessel, ranging from small autonomous examples to one- or two-person vessels operating for a few hours, to vessels which can remain submerged for 6 months such as the  Russian  Typhoon class  Ã¢â‚¬â€œ the biggest submarines ever built and in use. Submarines can work at greater depths than are survivable or practical for human  divers. Modern deep diving submarines are derived from the  bathyscaphe, which in turn was an evolution of the  diving bell. History†¦ The first submersible of which we have reliable information on its construction was built in 1620 by  Cornelius Drebbel, a  Dutchman  in the service of  James I of England. It was created to the standards of the design outlined by English mathematician  William Bourne. It was propelled by means of oars. The precise nature of the submarine type is a matter of some controversy; some claim that it was merely a bell towed by a boat. Two improved types were tested in the  Thames  between 1620 and 1624. In 2002 a two-person version of Bourne’s design was built for the  BBC  TV programme  Building the Impossible  by  Mark Edwards, and successfully rowed under water at  Dorney Lake,  Eton. Though the first submersible vehicles were tools for exploring under water, it did not take long for inventors to recognize their military potential. The strategic advantages of submarines were set out by Bishop  John Wilkins  of  Chester, England, in  Mathematicall Magick  in 1648: 1. This private: a man may thus go to any coast in the world invisibly, without discovery or prevented in his journey. 2. This safe, from the uncertainty of Tides, and the violence of Tempests, which do never move the sea above five or six paces deep. From Pirates and Robbers which do so infest other voyages; from ice and great frost, which do so much endanger the passages towards the Poles. 3. It may be of great advantages against a Navy of enemies, who by this may be undermined in the water and blown up. 4. It may be of special use for the relief of any place besieged by water, to convey unto them invisible supplies; and so likewise for the surprisal of any place that is accessible by water. 5. It may be of unspeakable benefit for submarine experiment How it work†¦ The adaptations and inventions that allow sailors to not only fight a battle, but also live for months or even years underwater are some of the most brilliant developments in military history. In this article, you will see how a submarine dives and surfaces in the water, how life support is maintained, how the submarine gets its power, how a submarine finds its way in the deep ocean and how submarines might be rescued. Ultrasound scanning device†¦ Ultrasound  is a cyclic  sound  pressure wave with a  frequency  greater than the upper limit of the human  hearing range. Ultrasound is thus not separated from â€Å"normal† (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20  kilohertz  (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20  kHz up to several gigahertz. Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasonic imaging (sonography) is used in human and veterinary medicine. In non-destructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning and for mixing, and to accelerate chemical processes. Organisms such as bats and porpoises use ultrasound for locating prey and obstacles. Ultrasonics  is the application of  ultrasound. Ultrasound can be used for imaging, detection, measurement, and cleaning. At higher power levels ultrasonics are useful for changing the chemical  . History †¦ Acoustics, the science of sound, starts as far back as  Pythagoras  in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Sir  Francis Galton  constructed  a whistle  producing ultrasound in 1893. The first technological application of ultrasound was an attempt to detect icebergs by  Paul Langevin  in 1917. The  piezoelectric effect  discovered by Jacques and Pierre Curie in 1880 was useful in transducers to generate and detect ultrasonic waves in air and water. [2]  Echolocation  in bats was discovered byLazzaro Spallanzani  in 1794, when he demonstrated that bats hunted and navigated by inaudible sound and not vision. How it works†¦ There are many reasons to get an ultrasound. Perhaps you’re pregnant, and your obstetrician wants you to have an ultrasound to check on the developing baby or determine the due date. Maybe you’re having problems with blood  circulation in a limb or your heart, and your doctor has requested a Doppler ultrasound to look at the blood flow. Ultrasound has been a popular medical imaging technique for many years. Ultrasound  or  ultrasonography is a medical imaging technique that uses high frequency sound waves and their echoes. The technique is similar to the echolocation used by bats, whales and dolphins, as well as SONAR used by  submarines. In this article, we’ll look at how ultrasound works, what type of ultrasound techniques are vailable and what each technique can be used for. Magnifying glass†¦ A  magnifying glass  (called a  hand lens  in laboratory contexts) is a  convex lens  that is used to produce a  magnified  image  of an object. The  lens  is usually mounted in a frame with a handle (see image). A  sheet magnifier  consists of many very narrow concentric ring-shaped lenses, such that the combination a cts as a single lens but is much thinner. This arrangement is known as aFresnel lens. The magnifying glass is an icon of  detective fiction, particularly that of  Sherlock Holmes. History †¦ The earliest evidence of â€Å"a magnifying device, a convex lens forming a magnified image† was Aristophanes’s â€Å"lens†, from 424 BC, a glass globe filled with water. (Seneca  wrote that it could be used to read letters â€Å"no matter how small or dim†). [1]  Roger Bacon  described the properties of a magnifying glass in 13th-century  England. Eyeglasses  were developed in 13th-century  Italy. How it works†¦ The  magnification  of a magnifying glass depends upon where it is placed between the user’s eye and the object being viewed, and the total distance between them. The  magnifying power  is equivalent to  angular magnification  (this should not be confused with  optical power, which is a different quantity). The magnifying power is the ratio of the sizes of the images formed on the user’s retina with and without the lens. [3]  For the â€Å"without† case, it is typically assumed that the user would bring the object as close to the eye as possible without it becoming blurry. This point, known as the  near point,  varies with age. In a young child it can be as close as 5  cm, while in an elderly person it may be as far as one or two metres. Magnifiers are typically characterized using a â€Å"standard† value of 0. 25  m. The highest magnifying power is obtained by putting the lens very close to the eye and moving the eye and the lens together to obtain the best  focus. The object will then typically also be close to the lens. Sense of hearing†¦ Hearing,  auditory perception, or  audition  is the ability to perceive  sound  by detectingvibrations,  changes in the pressure of the surrounding medium through time, through an organ such as the  ear. Sound may be heard through  solid,  liquid, or  gaseous  matter. It is one of the traditional five  senses. The inability to hear is called  deafness. In humans and other vertebrates, hearing is performed primarily by the  auditory system: vibrations are detected by the  ear  and transduced into nerve impulses that are perceived by the  brain  (primarily in the  temporal lobe). Like  touch, audition requires sensitivity to the movement of molecules in the world outside the organism. Both hearing and touch are types of mechanosensation. Stethoscope †¦ The  stethoscope  is an acoustic  medical  device for  auscultation, or listening to the internal sounds of an animal or human body. It is often used to listen to lung and  heart sounds. It is also used to listen to  intestines  and blood flow in  arteries  and  veins. In combination with asphygmomanometer, it is commonly used for measurements of  blood pressure. Less commonly, â€Å"mechanic’s stethoscopes† are used to listen to internal sounds made by machines, such as diagnosing a malfunctioning automobile engine by listening to the sounds of its internal parts. Stethoscopes can also be used to check scientific vacuum chambers for leaks, and for various other small-scale acoustic monitoring tasks. A stethoscope that intensifies auscultatory sounds is called  phonendoscope. History†¦ The stethoscope was invented in  France  in 1816 by  Rene Laennec  at the  Necker-Enfants Malades Hospital  in  Paris. [1]  It consisted of a wooden tube and was monaural. His device was similar to the common  ear trumpet, a historical form of hearing aid; indeed, his invention was almost indistinguishable in structure and function from the trumpet, which was commonly called a â€Å"microphone†. The first flexible stethoscope of any sort may have been a binaural instrument with articulated joints not very clearly described in 1829. 2]  In 1840,Golding Bird  described a stethoscope he had been using with a flexible tube. Bird was the first to publish a description of such a stethoscope but he noted in his paper the prior existence of an earlier design (which he thought was of little utility) which he described as the snake ear trumpet. Bird’s stethoscope ha d a single earpiece. [3]  In 1851, Irish physician Arthur Leared invented a binaural stethoscope, and in 1852 George Cammann perfected the design of the instrument for commercial production, which has become the standard ever since. Cammann also wrote a major treatise on diagnosis by auscultation, which the refined binaural stethoscope made possible. By 1873, there were descriptions of a differential stethoscope that could connect to slightly different locations to create a slight stereo effect, though this did not become a standard tool in clinical practice. The medical historian  Jacalyn Duffin  has argued that the invention of the stethoscope marked a major step in the redefinition of disease from being a bundle of symptoms, to the current sense of a disease as a problem with an anatomical system even if there are no noticeable symptoms. This re-conceptualiization occurred in part, Duffin argues, because prior to the stethoscopes, there were no non-lethal instruments for exploring internal anatomy. [4] Rappaport and Sprague designed a new stethoscope in the 1940s, which became the standard by which other stethoscopes are measured, consisting of two sides, one of which is used for the respiratory system, the other for the cardiovascular system. The Rappaport-Sprague was later made by  Hewlett-Packard. HP’s medical products division was spun off as part of Agilent Technologies, Inc. , where it became Agilent Healthcare. Agilent Healthcare was purchased byPhilips  which became Philips Medical Systems, before the walnut-boxed, $300, original Rappaport-Sprague stethoscope was finally abandoned ca. 2004, along with Philips’ brand (manufactured by Andromed, of Montreal, Canada) electronic stethoscope model. The Rappaport-Sprague model stethoscope was heavy and short (18–24  in (46–61  cm)) with an antiquated appearance recognizable by their two large independent latex rubber tubes connecting an exposed-leaf-spring-joined-pair of opposing â€Å"f†-shaped chrome-plated brass binaural ear tubes with a dual-head chest piece. How to use†¦ * Clean off the earpieces before placing the stethoscope into your ears, especially if others share it or you seldom use it. In the hospital, earpieces are wiped with alcohol prep swabs. * Hold the chest piece between your palms to warm it before placing it on a person’s chest. Thirty seconds is usually long enough to remove the chill. * Place the stethoscope into your ears. * Hold the chest piece in your hand. With the other hand, tap a finger against the chest piece and listen. Many stethoscopes have reversible heads, which can be incompletely swiveled and block sound. Grip the chest piece between your middle and index fingers to provide firm contact with the skin. * To minimize extraneous noises, avoid touching or rubbing the tubing or chest piece against clothing, bedcovers or hair. * Place the chest piece onto the part of the body you want to listen to. For the heart, this is a few inches above the left nipple. You should hear a steady â€Å"lub dub. â €  This is known as the apical pulse. * Store your stethoscope so that the tubing isn’t kinked when you put it away. In hospitals, when stethoscopes are not being used, they’re generally hung by their earpieces so that the tubing can dangle freely. Loudhailer†¦ A  megaphone,  speaking-trumpet,  bullhorn,  blowhorn, or  loud hailer  is a portable, usually hand-held, cone-shaped  acoustic horn  used to  amplify  a person’s voice or othersounds  and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves radiate out the wide end. The megaphone increases the volume of sound by increasing the  acoustic impedance  seen by the  vocal cords,  matching  the impedance of the vocal cords to the air, so that more sound power is radiated. It also serves to direct the sound waves in the direction the horn is pointing. It somewhat distorts the sound of the voice because thefrequency response  of the megaphone is greater at higher sound  frequencies. Since the 1970s the voice-powered  acoustic megaphone  described above has been replaced by theelectric megaphone, which uses electric power to  amplify  the voice. History†¦ The initial inventor of the speaking trumpet is a subject of historical controversy, as both  Samuel Morland  and  Athanasius Kircher  lay claim to the device. Morland, in a work published in 1655, wrote about his experimentation with different horns and his most successful variant. This loudest horn was made of over 20 feet of copper and could supposedly project vocalizations as far as a mile and a half. [1] Twenty years earlier, Kircher described a device that could be used for both broadcasting on one end and â€Å"overhearing† on the other. His coiled horn would be wedged into the side of a building, connecting a speaker or listener inside with the surrounding environment. Morland favored a straight, tube-shaped speaking device, where an initial sound would reverberate in waves through the instrument and gradually become louder. Kircher’s horn, on the other hand, utilized a â€Å"cochleate† design, where the horn was twisted and coiled, unlike Morland’s design. A later,  papier-mache  trumpet of special design was the Sengerphone. [2] The term ‘megaphone’ was first associated with  Thomas Edison’s instrument 200 years later. In 1878, Edison developed a device similar to the speaking trumpet in hopes of benefiting the deaf and hard of hearing. His variation included three separate funnels lined up in a row. The two outer funnels, which were six feet and eight inches long, were made of paper and connected to a tube inserted in each ear. The middle funnel was similar to Morland’s speaking trumpet, but had a larger slot to insert a user’s mouth. [3] With Edison’s megaphone, a low whisper could be heard a thousand feet away, while a normal tone of voice could be heard roughly two miles away. On the listening end, the receiver could hear a low whisper at a thousand feet away. However the apparatus was much too large to be portable, limiting its use. George Prescott wrote: â€Å"The principal drawback at present is the large size of the apparatus. † Since the 1960s acoustic megaphones have generally been replaced by electric versions  (below), although the cheap, light, rugged acoustic megaphone is still used in a few venues, like cheering at sporting events,  cheerleading, and by  lifeguards  at pools and beaches where the moisture could damage the electronics of electric megaphones. How to use†¦ * Hold the megaphone several inches from your mouth with the small end toward you and the large end away from you. * Point the large end of the megaphone toward the crowd you wish to exhort. Speak loudly or shout into the small end. * Wait for the crowd’s response, then repeat Step 3 as necessary. Sonar†¦ Sonar  (originally an  acronym  for  Sound  Navigation  And  Ranging) is a technique that uses  sound  propagation (usually underwater, as in  submarine navigation) to  navigate, co mmunicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name â€Å"sonar†:  passive  sonar is essentially listening for the sound made by vessels;  active  sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of  acoustic location  and of measurement of the echo characteristics of â€Å"targets† in the water. Acoustic location in air was used before the introduction of  radar. Sonar may also be used in air for robot navigation, and  SODAR  (an upward looking in-air sonar) is used for atmospheric investigations. The term  sonar  is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as  underwater acoustics  orhydroacoustics. History†¦ Although some animals (dolphins and bats) have used sound for communication and object detection for millions of years, use by humans in the water is initially recorded by  Leonardo Da Vinci  in 1490: a tube inserted into the water was said to be used to detect vessels by placing an ear to the tube. [1] In the 19th century an underwater bell was used as an ancillary to  lighthouses  to provide warning of hazards. The use of sound to ‘echo locate’ underwater in the same way as  bats  use sound for aerial navigation seems to have been prompted by the  Titanic  disaster of 1912. The world’s first  patent  for an underwater echo ranging device was filed at the British  Patent Office  by English meteorologist  Lewis Richardson  a month after the sinking of the Titanic,[2]  and a German physicist  Alexander Behm  obtained a patent for an echo sounder in 1913. The Canadian engineer  Reginald Fessenden, while working for the Submarine Signal Company in Boston, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U. S. Revenue (now Coast Guard) Cutter Miami on the  Grand Banks  off  Newfoundland  Canada. 2][3]  In that test, Fessenden demonstrated depth sounding, underwater communications (Morse Code) and echo ranging (detecting an iceberg at two miles (3  km) range). [4][5]  The so-called  Fessenden  oscillator, at ca. 500  Hz frequency, was unable to determine the bearing of the berg due to the 3 metre wavelength and the small dimension of the transduce r’s radiating face (less than 1 metre in diameter). The ten  Montreal-built  British H class submarines  launched in 1915 were equipped with aFessenden oscillator. [6] During  World War I  the need to detect  submarines  prompted more research into the use of sound. The British made early use of underwater hydrophones, while the French physicist  Paul Langevin, working with a Russian immigrant electrical engineer,  Constantin Chilowski, worked on the development of active sound devices for detecting submarines in 1915 using quartz. Although  piezoelectricand magnetostrictive transducers later superseded the  electrostatic  transducers they used, this work influenced future designs. Lightweight sound-sensitive plastic film and fibre optics have been used for  hydrophones  (acousto-electric transducers for in-water use), while  Terfenol-D  and PMN (lead magnesium niobate) have been developed for projectors. How to use†¦ * Install the transmitter. You’ll usually have a choice between mounting the transmitter beneath the boat, to a trolling motor or atop the interior hull and letting it drop into the water. * Set the fish finding sonar’s sensitivity while watching the display. When the sensitivity is too high, there will be static-like patterns on the display. If the sensitivity is too low, not even the bottom of the body of the water will appear on screen. * 3 * Determine the depth of the body of water. This will be a numeric value on the fish finder sonar system’s display. This is important in helping you to determine how much fishing line to feed out from your pole. * Get accustomed to the display’s representation of the body of water. The bottom will appear as a jagged, solid line near the bottom of your display. The surface of the water appears as a jumbled static-filled horizontal line at the top of your fish finder sonar system’s display. * Learn to identify patterns on your display that are brush piles if you’re fishing on a lake. Brush piles appear as blobs resting on the lake bottom. Fish such as bass hide out in brush piles, so consider fishing near these echoes. * Learn how to identify fish on your fish finder sonar system display with the fish symbols turned off. With the symbols turned off, fish appear as short curved lines above the bottom of the body of water. Adjust the fish finder sonar’s noise filter if there are lines in your display that look like random static. * Remember what the fish finder sonar display was indicating when you catch a fish. This will help you to learn how to use your system to catch more fish later if you keep in mind what to look for. How to cite Device to Overcome Sense of Sight and Hear, Essay examples

Device to Overcome Sense of Sight and Hear Free Essays

string(63) " production of highly regarded binoculars, with a few changes\." SENSE OF SIGHT†¦. The eyes are sensory organs. They keep the brain updated with information about is what happening around the body. We will write a custom essay sample on Device to Overcome Sense of Sight and Hear or any similar topic only for you Order Now Both contain millions of tiny sensors that send messages along nerves to the brain. Sensors in the eyes respond to light and, through the brain, let us see the world. Sensors in the skin respond to touch and allows us to feel. * * * * The seeing eye†¦ Light enters the eye through the clear cornea. It then passes through the pupil and is focused by the lens on the retina. This thin layer covers the back of the eye and contains cells that are sensitive to light. When light hits the cells, they send signals to the brain. There, the signals are turned into pictures so we can see. Telescope†¦ A  telescope  is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation  (such as  visible light). The first known practical telescopes were invented in the  Netherlands  at the beginning of the 17th century, using glass lenses. They found use in terrestrial applications and astronomy. Within a few decades, the  reflecting telescope  was invented, which used mirrors. In the 20th century many new types of telescopes were invented, including  radio telescopes  in the 1930s and  infrared telescopes  in the 1960s. The word  telescope  now refers to a wide range of instruments detecting different regions of the  electromagnetic spectrum, and in some cases other types of detectors. History†¦ The earliest recorded working telescopes were the  refracting telescopes  that appeared in the Netherlands  in 1608. Their development is credited to three individuals:  Hans Lippershey  and Zacharias Janssen, who were spectacle makers in Middelburg, and  Jacob Metius  of Alkmaar. 4]  Galileo  heard about the Dutch telescope in June 1609, built his own within a month,[5]  and greatly improved upon the design in the following year. The idea that the  objective, or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope. [6]  The potential advan tages of using  parabolic mirrors—reduction of  spherical aberration  and no  chromatic aberration—led to many proposed designs and several attempts to build  reflecting telescopes. 7]  In 1668,  Isaac Newton  built the first practical reflecting telescope, of a design which now bears his name, the  Newtonian reflector. The invention of the  achromatic lens  in 1733 partially corrected color aberrations present in the simple lens and enabled the construction of shorter, more functional refracting telescopes. Reflecting telescopes, though not limited by the color problems seen in refractors, were hampered by the use of fast tarnishing  speculum metal  mirrors employed during the 18th and early 19th century—a problem alleviated by the introduction of silver coated glass mirrors in 1857,[8]  and aluminized mirrors in 1932. 9]  The maximum physical size limit for refracting telescopes is about 1 meter (40  inches), dictating that the vast majority of large optical researching telescopes built since the turn of the 20th century have been reflectors. The largest reflecting telescopes currently have objectives larger than 10  m (33  feet). The 20th century also saw the development of telescopes that worked in a wide range of wavelengths from  radio  to  gamma-rays. The first purpose built radio telescope went into operation in 1937. Since then, a tremendous variety of complex astronomical instruments have been developed. How to use†¦ * Find an area where the items you wish to view aren’t obstructed by trees to set up your telescope so that you get a clear view of the sky. * Look to see if your telescope has a polar axis. If it does, it will track whatever you are looking at. If you have a telescope with a polar axis, follow your manufacturer’s directions on how to align the polar axis and the finder scope. * Select the eyepiece with the lowest magnification that you have. Always start with the lowest magnification eyepiece until you become more experienced in using your telescope. Locate the item in the night sky that you wish to observe and focus in on it. Move the planet or star you are viewing as close to the center of the field of view in the eyepiece as possible. * Remove the low magnification eyepiece and replace it with an eyepiece with a higher magnification. * Readjust the alignment of the telescope when the planet or star drifts out of view if you have a manual telescope mount. * Continue in this manner, observing different visible planets and stars. Binoculars †¦ Binoculars,  field glasses  or  binocular telescopes  are a pair of identical or mirror-symmetrical  telescopes  mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although sizes vary widely from  opera glasses  to large pedestal mounted military models. Many different abbreviations are used for binoculars, including  glasses, nocs ,noculars ,  binos  and  bins. Unlike a (monocular) telescope, binoculars give users a three-dimensional image: for nearer objects the two views, presented to ach of the viewer’s eyes from slightly different viewpoints, produce a merged view with an  impression of depth. History †¦ No sooner was the telescope invented in than the early 1600s than did astronomers get the idea of mounting two of them together, effectively inventing the first binoculars. Galileo (who is often falsely credited with having invented binoculars) adapted an earlier design, using optics that combined convex and concave lenses to create a magnifying effect just like that used today in the cheapest nonprismatic glasses marketed for sports or theater viewing, or for use by children. In the mid-1850s, Ignazio Porro of Italy patented a design using two prisms constructed in a Z shape to present the viewer with an image that not only is better magnified, but has depth. The Porro prism design was followed a few decades later by the roof prism, in which the prisms are constructed in one unit. Soon, binoculars were adapted for military use, and were employed during the Civil War. Quality made a big jump around the turn of the 19th century, and continued to be refined in the early 1900s. With the advent of World War II, more manufacturers entered the binoculars market, including, in the United States, Bausch ; Lomb. Germany continued with its production of highly regarded binoculars, with a few changes. You read "Device to Overcome Sense of Sight and Hear" in category "Essay examples" For example, Zeiss, one of the top names in binoculars, experienced a confusing shift, with a new factory established in East Germany under Russian control with the Zeiss name while another factory named Zeiss was began exporting from West Germany, according to a history in the 1961 book Binoculars and Scopes and Their Uses in Photography, by Robert J. and Elsa Reichert. Japan exports binoculars via various manufacturers, and some U. S. ompanies import Japanese-made binoculars but sell them under the U. S. company name. How to use†¦ * Put the binocular strap around your neck. Wearing the neck-strap gives you the ability to use both hands while you are using the binoculars. * Adjust the barrels of the binoculars — each side you look into — to the width of your face. Generally, all you need to do i s move the barrels closer together or further apart as you hold the binoculars up to your eyes. If you have adjusted the binoculars correctly, you should not see a black â€Å"border† when you look through the eyepieces. Locate the central focus wheel, usually in the middle of the two barrels of the binoculars. Turn the wheel slowly as you look at a particular object in the distance to get the best focus for your eyes. * Fine-tune your viewing even more if you have a diopter focus mechanism on your binoculars. Not all binoculars have this focus element, which helps compensate for the difference in vision that you might experience in each of your eyes. The diopter focus adjustment wheel is usually on the right-hand barrel. * Keep both eyes open as you view your target objects. You might need to re-focus from time to time. * Clean your binoculars after using them. A soft, damp cloth is sufficient for the body of the binoculars. Treated tissue paper used to clean cameras and eye glasses is safe for wiping the lenses. Store binoculars in their carrying case when you’re not using them. Microscope †¦ A  microscope  (from the  Ancient Greek:   ,  mikros, â€Å"small† and   ,  skopein, â€Å"to look† or â€Å"see†) is an  instrument  used to see objects that are too small for the naked eye. The science of investigating small objects using such an instrument is called  microscopy . Microscopic  means invisible to the eye unless aided by a microscope. There are many types of microscopes, the most common and first to be invented is theoptical microscope  which uses  light  to image the sample. Other major types of microscopes are the  electron microscope  (both the  transmission electron microscope  and the  scanning electron microscope) and the various types of  scanning probe microscope History †¦ The first microscope to be developed was the optical microscope, although the original inventor is not easy to identify. An early microscope was made in 1590 in  Middelburg, Netherlands. 1]  Two  eyeglass  makers are variously given credit:  Hans Lippershey   (who developed an early  telescope) and  Zacharias Janssen. Giovanni Faber  coined the namemicroscope   for  Galileo Galilei’s compound microscope in 1625  [2]  (Galileo had called it the â€Å"occhiolino† or â€Å"little eye†). How to useâ⠂¬ ¦. * When moving your microscope, always carry it with both hands (Figure 1, below). Grasp the arm with one hand and place the other hand under the base for support. * Turn the revolving nosepiece so that the lowest power objective lens is â€Å"clicked† into position (This is also the shortest objective lens). Your microscope slide should be prepared with a coverslip or cover glass over the specimen. This will help protect the objective lenses if they touch the slide. Place the microscope slide on the stage and fasten it with the stage clips. You can push down on the back end of the stage clip to open it. * Look at the objective lens and the stage from the side (Figure 2) and turn the coarse focus knob so that the objective lens moves downward (or the stage, if it moves, goes upward). Move it as far as it will go  without touching the slide! * 5. Now, look through the eyepiece and adjust the illuminator (or mirror) and diaphragm (Figure 3) for the greatest amount of light. | | | * Slowly turn the coarse adjustment so that the objective lens goes  up  (away from the slide). Continue until the image comes into focus. Use the fine adjustment, if available, for fine focusing. If you have a microscope with a moving stage, then turn the coarse knob so the stage moves downward or away from the objective lens. * Move the microscope slide around so that the image is in the center of the field of view and readjust the mirror, illuminator or diaphragm for the clearest image. Now, you should be able to change to the next objective lenses with only minimal use of the focusing adjustment. Use the fine adjustment, if available. If you cannot focus on your specimen, repeat steps 4 through 7 with the higher power objective lens in place. Do not allow the objective lens to touch the slide! * The proper way to use a monocular microscope is to look through the eyepiece with one eye and keep the other eye open (this helps avoid eye strain). If you have to close one eye when looking into the microscope, it’s ok. Remember, everything is upside down and backwards. When you move the slide to the right, the image goes to the left! * Do not touch the glass part of the lenses with your fingers. Use only special lens paper to clean the lenses. * When finished, raise the tube (or lower the stage), click the low power lens into position and remove the slide. * Always keep your microscope covered when not in use. Submarine†¦ A  submarine  is a  watercraft  capable of independent operation underwater. It differs from a  submersible, which has more limited underwater capability. The term submarine most commonly refers to a large crewed autonomous vessel. However, historically or colloquially, submarine can also refer to medium-sized or smaller vessels (midget submarines,  wet subs),  remotely operated vehiclesor  robots. The adjective  submarine, in terms such as  submarine cable, means â€Å"under the sea†. The noun  submarine  evolved as a shortened form of  submarine boat(and is often further shortened to  sub). [1]  For reasons of  naval traditionsubmarines are usually referred to as â€Å"boats† rather than as â€Å"ships†, regardless of their size. Although experimental submarines had been built before, submarine design took off during the 19th century, and they were adopted by several navies. Submarines were first widely used during  World War I  (1914–1918) and now figure in many large  navies. Military usage includes attacking enemy surface ships or submarines,  aircraft carrier  protection,  blockaderunning,  ballistic missile submarines  as part of a nuclear strike force,  reconnaissance, conventional land attack (for example using acruise missile), and covert insertion of  special forces. Civilian uses for submarines include  marine science, salvage, exploration and facility inspection/maintenance. Submarines can also be modified to perform more specialized functions such as search-and-rescue missions or  undersea cable  repair. Submarines are also used in tourism, and for  undersea archaeology. Most large submarines consist of a cylindrical body with hemispherical (and/or conical) ends and a vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes. In modern submarines this structure is the â€Å"sail† in American usage, and â€Å"fin† in European usage. A â€Å"conning tower† was a feature of earlier designs: a separate pressure hull above the main body of the boat that allowed the use of shorter periscopes. There is a propeller (or pump jet) at the rear and various hydrodynamic control fins as well as ballast tanks. Smaller, deep diving and specialty submarines may deviate significantly from this traditional layout. Submarines have one of the largest ranges of capabilities in any vessel, ranging from small autonomous examples to one- or two-person vessels operating for a few hours, to vessels which can remain submerged for 6 months such as the  Russian  Typhoon class  Ã¢â‚¬â€œ the biggest submarines ever built and in use. Submarines can work at greater depths than are survivable or practical for human  divers. Modern deep diving submarines are derived from the  bathyscaphe, which in turn was an evolution of the  diving bell. History†¦ The first submersible of which we have reliable information on its construction was built in 1620 by  Cornelius Drebbel, a  Dutchman  in the service of  James I of England. It was created to the standards of the design outlined by English mathematician  William Bourne. It was propelled by means of oars. The precise nature of the submarine type is a matter of some controversy; some claim that it was merely a bell towed by a boat. Two improved types were tested in the  Thames  between 1620 and 1624. In 2002 a two-person version of Bourne’s design was built for the  BBC  TV programme  Building the Impossible  by  Mark Edwards, and successfully rowed under water at  Dorney Lake,  Eton. Though the first submersible vehicles were tools for exploring under water, it did not take long for inventors to recognize their military potential. The strategic advantages of submarines were set out by Bishop  John Wilkins  of  Chester, England, in  Mathematicall Magick  in 1648: 1. This private: a man may thus go to any coast in the world invisibly, without discovery or prevented in his journey. 2. This safe, from the uncertainty of Tides, and the violence of Tempests, which do never move the sea above five or six paces deep. From Pirates and Robbers which do so infest other voyages; from ice and great frost, which do so much endanger the passages towards the Poles. 3. It may be of great advantages against a Navy of enemies, who by this may be undermined in the water and blown up. 4. It may be of special use for the relief of any place besieged by water, to convey unto them invisible supplies; and so likewise for the surprisal of any place that is accessible by water. 5. It may be of unspeakable benefit for submarine experiment How it work†¦ The adaptations and inventions that allow sailors to not only fight a battle, but also live for months or even years underwater are some of the most brilliant developments in military history. In this article, you will see how a submarine dives and surfaces in the water, how life support is maintained, how the submarine gets its power, how a submarine finds its way in the deep ocean and how submarines might be rescued. Ultrasound scanning device†¦ Ultrasound  is a cyclic  sound  pressure wave with a  frequency  greater than the upper limit of the human  hearing range. Ultrasound is thus not separated from â€Å"normal† (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20  kilohertz  (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20  kHz up to several gigahertz. Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasonic imaging (sonography) is used in human and veterinary medicine. In non-destructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning and for mixing, and to accelerate chemical processes. Organisms such as bats and porpoises use ultrasound for locating prey and obstacles. Ultrasonics  is the application of  ultrasound. Ultrasound can be used for imaging, detection, measurement, and cleaning. At higher power levels ultrasonics are useful for changing the chemical  . History †¦ Acoustics, the science of sound, starts as far back as  Pythagoras  in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Sir  Francis Galton  constructed  a whistle  producing ultrasound in 1893. The first technological application of ultrasound was an attempt to detect icebergs by  Paul Langevin  in 1917. The  piezoelectric effect  discovered by Jacques and Pierre Curie in 1880 was useful in transducers to generate and detect ultrasonic waves in air and water. [2]  Echolocation  in bats was discovered byLazzaro Spallanzani  in 1794, when he demonstrated that bats hunted and navigated by inaudible sound and not vision. How it works†¦ There are many reasons to get an ultrasound. Perhaps you’re pregnant, and your obstetrician wants you to have an ultrasound to check on the developing baby or determine the due date. Maybe you’re having problems with blood  circulation in a limb or your heart, and your doctor has requested a Doppler ultrasound to look at the blood flow. Ultrasound has been a popular medical imaging technique for many years. Ultrasound  or  ultrasonography is a medical imaging technique that uses high frequency sound waves and their echoes. The technique is similar to the echolocation used by bats, whales and dolphins, as well as SONAR used by  submarines. In this article, we’ll look at how ultrasound works, what type of ultrasound techniques are vailable and what each technique can be used for. Magnifying glass†¦ A  magnifying glass  (called a  hand lens  in laboratory contexts) is a  convex lens  that is used to produce a  magnified  image  of an object. The  lens  is usually mounted in a frame with a handle (see image). A  sheet magnifier  consists of many very narrow concentric ring-shaped lenses, such that the combination a cts as a single lens but is much thinner. This arrangement is known as aFresnel lens. The magnifying glass is an icon of  detective fiction, particularly that of  Sherlock Holmes. History †¦ The earliest evidence of â€Å"a magnifying device, a convex lens forming a magnified image† was Aristophanes’s â€Å"lens†, from 424 BC, a glass globe filled with water. (Seneca  wrote that it could be used to read letters â€Å"no matter how small or dim†). [1]  Roger Bacon  described the properties of a magnifying glass in 13th-century  England. Eyeglasses  were developed in 13th-century  Italy. How it works†¦ The  magnification  of a magnifying glass depends upon where it is placed between the user’s eye and the object being viewed, and the total distance between them. The  magnifying power  is equivalent to  angular magnification  (this should not be confused with  optical power, which is a different quantity). The magnifying power is the ratio of the sizes of the images formed on the user’s retina with and without the lens. [3]  For the â€Å"without† case, it is typically assumed that the user would bring the object as close to the eye as possible without it becoming blurry. This point, known as the  near point,  varies with age. In a young child it can be as close as 5  cm, while in an elderly person it may be as far as one or two metres. Magnifiers are typically characterized using a â€Å"standard† value of 0. 25  m. The highest magnifying power is obtained by putting the lens very close to the eye and moving the eye and the lens together to obtain the best  focus. The object will then typically also be close to the lens. Sense of hearing†¦ Hearing,  auditory perception, or  audition  is the ability to perceive  sound  by detectingvibrations,  changes in the pressure of the surrounding medium through time, through an organ such as the  ear. Sound may be heard through  solid,  liquid, or  gaseous  matter. It is one of the traditional five  senses. The inability to hear is called  deafness. In humans and other vertebrates, hearing is performed primarily by the  auditory system: vibrations are detected by the  ear  and transduced into nerve impulses that are perceived by the  brain  (primarily in the  temporal lobe). Like  touch, audition requires sensitivity to the movement of molecules in the world outside the organism. Both hearing and touch are types of mechanosensation. Stethoscope †¦ The  stethoscope  is an acoustic  medical  device for  auscultation, or listening to the internal sounds of an animal or human body. It is often used to listen to lung and  heart sounds. It is also used to listen to  intestines  and blood flow in  arteries  and  veins. In combination with asphygmomanometer, it is commonly used for measurements of  blood pressure. Less commonly, â€Å"mechanic’s stethoscopes† are used to listen to internal sounds made by machines, such as diagnosing a malfunctioning automobile engine by listening to the sounds of its internal parts. Stethoscopes can also be used to check scientific vacuum chambers for leaks, and for various other small-scale acoustic monitoring tasks. A stethoscope that intensifies auscultatory sounds is called  phonendoscope. History†¦ The stethoscope was invented in  France  in 1816 by  Rene Laennec  at the  Necker-Enfants Malades Hospital  in  Paris. [1]  It consisted of a wooden tube and was monaural. His device was similar to the common  ear trumpet, a historical form of hearing aid; indeed, his invention was almost indistinguishable in structure and function from the trumpet, which was commonly called a â€Å"microphone†. The first flexible stethoscope of any sort may have been a binaural instrument with articulated joints not very clearly described in 1829. 2]  In 1840,Golding Bird  described a stethoscope he had been using with a flexible tube. Bird was the first to publish a description of such a stethoscope but he noted in his paper the prior existence of an earlier design (which he thought was of little utility) which he described as the snake ear trumpet. Bird’s stethoscope ha d a single earpiece. [3]  In 1851, Irish physician Arthur Leared invented a binaural stethoscope, and in 1852 George Cammann perfected the design of the instrument for commercial production, which has become the standard ever since. Cammann also wrote a major treatise on diagnosis by auscultation, which the refined binaural stethoscope made possible. By 1873, there were descriptions of a differential stethoscope that could connect to slightly different locations to create a slight stereo effect, though this did not become a standard tool in clinical practice. The medical historian  Jacalyn Duffin  has argued that the invention of the stethoscope marked a major step in the redefinition of disease from being a bundle of symptoms, to the current sense of a disease as a problem with an anatomical system even if there are no noticeable symptoms. This re-conceptualiization occurred in part, Duffin argues, because prior to the stethoscopes, there were no non-lethal instruments for exploring internal anatomy. [4] Rappaport and Sprague designed a new stethoscope in the 1940s, which became the standard by which other stethoscopes are measured, consisting of two sides, one of which is used for the respiratory system, the other for the cardiovascular system. The Rappaport-Sprague was later made by  Hewlett-Packard. HP’s medical products division was spun off as part of Agilent Technologies, Inc. , where it became Agilent Healthcare. Agilent Healthcare was purchased byPhilips  which became Philips Medical Systems, before the walnut-boxed, $300, original Rappaport-Sprague stethoscope was finally abandoned ca. 2004, along with Philips’ brand (manufactured by Andromed, of Montreal, Canada) electronic stethoscope model. The Rappaport-Sprague model stethoscope was heavy and short (18–24  in (46–61  cm)) with an antiquated appearance recognizable by their two large independent latex rubber tubes connecting an exposed-leaf-spring-joined-pair of opposing â€Å"f†-shaped chrome-plated brass binaural ear tubes with a dual-head chest piece. How to use†¦ * Clean off the earpieces before placing the stethoscope into your ears, especially if others share it or you seldom use it. In the hospital, earpieces are wiped with alcohol prep swabs. * Hold the chest piece between your palms to warm it before placing it on a person’s chest. Thirty seconds is usually long enough to remove the chill. * Place the stethoscope into your ears. * Hold the chest piece in your hand. With the other hand, tap a finger against the chest piece and listen. Many stethoscopes have reversible heads, which can be incompletely swiveled and block sound. Grip the chest piece between your middle and index fingers to provide firm contact with the skin. * To minimize extraneous noises, avoid touching or rubbing the tubing or chest piece against clothing, bedcovers or hair. * Place the chest piece onto the part of the body you want to listen to. For the heart, this is a few inches above the left nipple. You should hear a steady â€Å"lub dub. â €  This is known as the apical pulse. * Store your stethoscope so that the tubing isn’t kinked when you put it away. In hospitals, when stethoscopes are not being used, they’re generally hung by their earpieces so that the tubing can dangle freely. Loudhailer†¦ A  megaphone,  speaking-trumpet,  bullhorn,  blowhorn, or  loud hailer  is a portable, usually hand-held, cone-shaped  acoustic horn  used to  amplify  a person’s voice or othersounds  and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves radiate out the wide end. The megaphone increases the volume of sound by increasing the  acoustic impedance  seen by the  vocal cords,  matching  the impedance of the vocal cords to the air, so that more sound power is radiated. It also serves to direct the sound waves in the direction the horn is pointing. It somewhat distorts the sound of the voice because thefrequency response  of the megaphone is greater at higher sound  frequencies. Since the 1970s the voice-powered  acoustic megaphone  described above has been replaced by theelectric megaphone, which uses electric power to  amplify  the voice. History†¦ The initial inventor of the speaking trumpet is a subject of historical controversy, as both  Samuel Morland  and  Athanasius Kircher  lay claim to the device. Morland, in a work published in 1655, wrote about his experimentation with different horns and his most successful variant. This loudest horn was made of over 20 feet of copper and could supposedly project vocalizations as far as a mile and a half. [1] Twenty years earlier, Kircher described a device that could be used for both broadcasting on one end and â€Å"overhearing† on the other. His coiled horn would be wedged into the side of a building, connecting a speaker or listener inside with the surrounding environment. Morland favored a straight, tube-shaped speaking device, where an initial sound would reverberate in waves through the instrument and gradually become louder. Kircher’s horn, on the other hand, utilized a â€Å"cochleate† design, where the horn was twisted and coiled, unlike Morland’s design. A later,  papier-mache  trumpet of special design was the Sengerphone. [2] The term ‘megaphone’ was first associated with  Thomas Edison’s instrument 200 years later. In 1878, Edison developed a device similar to the speaking trumpet in hopes of benefiting the deaf and hard of hearing. His variation included three separate funnels lined up in a row. The two outer funnels, which were six feet and eight inches long, were made of paper and connected to a tube inserted in each ear. The middle funnel was similar to Morland’s speaking trumpet, but had a larger slot to insert a user’s mouth. [3] With Edison’s megaphone, a low whisper could be heard a thousand feet away, while a normal tone of voice could be heard roughly two miles away. On the listening end, the receiver could hear a low whisper at a thousand feet away. However the apparatus was much too large to be portable, limiting its use. George Prescott wrote: â€Å"The principal drawback at present is the large size of the apparatus. † Since the 1960s acoustic megaphones have generally been replaced by electric versions  (below), although the cheap, light, rugged acoustic megaphone is still used in a few venues, like cheering at sporting events,  cheerleading, and by  lifeguards  at pools and beaches where the moisture could damage the electronics of electric megaphones. How to use†¦ * Hold the megaphone several inches from your mouth with the small end toward you and the large end away from you. * Point the large end of the megaphone toward the crowd you wish to exhort. Speak loudly or shout into the small end. * Wait for the crowd’s response, then repeat Step 3 as necessary. Sonar†¦ Sonar  (originally an  acronym  for  Sound  Navigation  And  Ranging) is a technique that uses  sound  propagation (usually underwater, as in  submarine navigation) to  navigate, co mmunicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name â€Å"sonar†:  passive  sonar is essentially listening for the sound made by vessels;  active  sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of  acoustic location  and of measurement of the echo characteristics of â€Å"targets† in the water. Acoustic location in air was used before the introduction of  radar. Sonar may also be used in air for robot navigation, and  SODAR  (an upward looking in-air sonar) is used for atmospheric investigations. The term  sonar  is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as  underwater acoustics  orhydroacoustics. History†¦ Although some animals (dolphins and bats) have used sound for communication and object detection for millions of years, use by humans in the water is initially recorded by  Leonardo Da Vinci  in 1490: a tube inserted into the water was said to be used to detect vessels by placing an ear to the tube. [1] In the 19th century an underwater bell was used as an ancillary to  lighthouses  to provide warning of hazards. The use of sound to ‘echo locate’ underwater in the same way as  bats  use sound for aerial navigation seems to have been prompted by the  Titanic  disaster of 1912. The world’s first  patent  for an underwater echo ranging device was filed at the British  Patent Office  by English meteorologist  Lewis Richardson  a month after the sinking of the Titanic,[2]  and a German physicist  Alexander Behm  obtained a patent for an echo sounder in 1913. The Canadian engineer  Reginald Fessenden, while working for the Submarine Signal Company in Boston, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U. S. Revenue (now Coast Guard) Cutter Miami on the  Grand Banks  off  Newfoundland  Canada. 2][3]  In that test, Fessenden demonstrated depth sounding, underwater communications (Morse Code) and echo ranging (detecting an iceberg at two miles (3  km) range). [4][5]  The so-called  Fessenden  oscillator, at ca. 500  Hz frequency, was unable to determine the bearing of the berg due to the 3 metre wavelength and the small dimension of the transduce r’s radiating face (less than 1 metre in diameter). The ten  Montreal-built  British H class submarines  launched in 1915 were equipped with aFessenden oscillator. [6] During  World War I  the need to detect  submarines  prompted more research into the use of sound. The British made early use of underwater hydrophones, while the French physicist  Paul Langevin, working with a Russian immigrant electrical engineer,  Constantin Chilowski, worked on the development of active sound devices for detecting submarines in 1915 using quartz. Although  piezoelectricand magnetostrictive transducers later superseded the  electrostatic  transducers they used, this work influenced future designs. Lightweight sound-sensitive plastic film and fibre optics have been used for  hydrophones  (acousto-electric transducers for in-water use), while  Terfenol-D  and PMN (lead magnesium niobate) have been developed for projectors. How to use†¦ * Install the transmitter. You’ll usually have a choice between mounting the transmitter beneath the boat, to a trolling motor or atop the interior hull and letting it drop into the water. * Set the fish finding sonar’s sensitivity while watching the display. When the sensitivity is too high, there will be static-like patterns on the display. If the sensitivity is too low, not even the bottom of the body of the water will appear on screen. * 3 * Determine the depth of the body of water. This will be a numeric value on the fish finder sonar system’s display. This is important in helping you to determine how much fishing line to feed out from your pole. * Get accustomed to the display’s representation of the body of water. The bottom will appear as a jagged, solid line near the bottom of your display. The surface of the water appears as a jumbled static-filled horizontal line at the top of your fish finder sonar system’s display. * Learn to identify patterns on your display that are brush piles if you’re fishing on a lake. Brush piles appear as blobs resting on the lake bottom. Fish such as bass hide out in brush piles, so consider fishing near these echoes. * Learn how to identify fish on your fish finder sonar system display with the fish symbols turned off. With the symbols turned off, fish appear as short curved lines above the bottom of the body of water. Adjust the fish finder sonar’s noise filter if there are lines in your display that look like random static. * Remember what the fish finder sonar display was indicating when you catch a fish. This will help you to learn how to use your system to catch more fish later if you keep in mind what to look for. How to cite Device to Overcome Sense of Sight and Hear, Essay examples

WWII Prisoners of War Essay Example For Students

WWII Prisoners of War Essay Dear: The International Red Cross I am writing a letter to you today to mention how the prisoners of war were treated throughout the second world war.If you have never been a Prisoner of War (POW), you are extremely lucky. The prisoners of war during the World War II, (1939-1945) were treated poorly with no respect or consideration and were given the living conditions worse than animals. It was an extremely bad situation that no human being could survive. They were mistreated, manhandled, beat and even shot defending their country. No one wanted to go to war, but for those men who did, and for those who survived as POWs will always regret it. The Prisoners of War were kept in concentration camps, where it was day to day constant dying and suffering and separation of the family with unconditional weather. 1 They had no real shelter, and kept busy by working, and the odd time even got a chance to play baseball, soccer or some athletic game to stay in shape. 2 They were surrounded by tw enty-four hour guard surveillance in the middle of nowhere, so it would be quite useless to attempt to escape, especially at the risk of being gunned down at any given time. The POW were always having to turn their back and keep an eye out for one another. They were considered to be â€Å"hostages† and were treated like the enemy. The concentration camps were not very large but were numerous. They contained about 500-600 warriors and were divided into groups of under sixteen, older than sixteen, and of course by gender (Male and Female). 3 This caused many problems with the POWs as they were split from their families, and in a lot of cases, never saw one another again. The Prisoners of War were killed by the hundreds as malnutrition and hygiene eventually caught up with them. They were put to work for lengthy periods of time, and we treated harshly for volunteering to go to war. Once caught, they were taken and placed in a camp, and it was the beginning of the end for the all y. It is not like a prisoner in today’s society. The prisoners had to live with leftover scraps of food, dirty water, and no hope of exiting, plus the constant shooting. They were not prisoner whom had committed a crime, rather brave warriors whom stood up to defend us. 4 It is a life no one wants to encounter, and we pray no one does, and we remember how they were abused and how they suffered to protect us. This special day is called Remembrance Day and is celebrated the eleventh day of the eleventh month. BIBLIOGRAPHYWORLD WAR II, â€Å"Prisoners† Marshall Cavendish Ltd, New York, Vol VIII. 940.53WORLD WAR II, â€Å"Prisoners of War† Marshall Cavendish Ltd, New York, Vol III. 940.53WORLD WAR II, â€Å"Prisoners of War† Marshall Cavendish Ltd, New York, Vol X. 940.53Gosselin, Luc. PRISONS IN CANADA, Montreal, Quebec: Black Rose Books, 1982

Audit Planning and Risk Assessment Essay Sample free essay sample

Hearers should be after the audit so that the battle is conducted in an effectual mode. The aims of be aftering include: †¢ Directing appropriate attending to the different countries of the audit such as measuring materiality. so that when the detailed audit program is prepared. audit processs can be directed towards the stuff sums. †¢ Identify possible jobs or hazards so that they can be resolved at an early phase. †¢ Facilitate reappraisal and control of the audit. †¢ Assigning and briefing staff with appropriate accomplishments. cognition. preparation. proficiency. †¢ Organizing the work of others such as that of experts. †¢ Obtaining cognition and apprehension of the client’s concern. †¢ Supplying an economic and effectual service within appropriate timescales Planing an audit will allow development of: †¢ An audit scheme based on hazard analysis†¢ An audit program that turn toing the hazards identified. Planing processs: †¢ Review the old old ages working documents†¢ Identify job countries encountered†¢ Determine staffing demands†¢ Obtain an indicant of clip required†¢ If the client is new. We will write a custom essay sample on Audit Planning and Risk Assessment Essay Sample or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page reexamine the old auditors’ working documents to obtain shutting balances which will impact this year’s fiscal statements. †¢ Determine the trading form and jobs faced by the client company. †¢ Establish timetable. of import day of the months and deadlines †¢ Assess the consequence of alterations from old twelvemonth: 1. Systems 2. Law and ordinance 3. Accounting policies 4. Management 5. Other relevant affairs †¢ Perform analytical reappraisal or processs on the latest histories. †¢ Request readying of hard currency and net income projections where solvency jobs are foreseen. †¢ Review the work of internal audit. †¢ Evaluate whether trust on other expert is necessary †¢ Allocate and brief audit staff. ISA 315 Identifying and Assessing the Risks of Material Misstatement Through Understanding the Entity and Its Environment 1. The hearer should execute hazard appraisal processs in order to place and measure the hazards of material misstatement. Risk appraisal processs include: †¢ Making enquiries of direction and others within the entity †¢ Discuss with the client’s direction about its aims and outlooks. and its programs for accomplishing those ends †¢ Observation and review †¢ Perform analytical processs to assist the hearer in placing unusual minutess. 2. The hearer should obtain an apprehension of the entity and its environment. including the entity’s internal control systems. Understanding of the entity and its environment will assist the hearer to place the hazards of material mis-statement ; will supply the hearer with a footing for planing and implementing responses to assessed hazard and to guarantee that sufficient appropriate audit grounds is collected. An apprehension of the entity can be obtained through understanding †¢ Relevant industry. regulative. and the applicable fiscal coverage model †¢ The nature of its operations ; its ownership construction and administration construction †¢ The market and its competition †¢ Nature of products/services and markets†¢ Location of production installations and mills†¢ Key clients and providers†¢ Capital investing activities†¢ Significant changes over anterior old ages.3. The hearer should place and measure the hazards of material misstatement. and find whether any of the hazards identified are important hazards. This will assist the hearer to plan and execute farther audit processs. RISK ASSESSMENT The hearer should place and measure the hazards of material misstatement. whether due to fraud or mistake. at the fiscal statement and averment degrees. The hearer must obtain an apprehension of the entity and its environment. including internal controls. so that they can place and measure the hazards of material misstatement on fiscal statements due to fraud or mistake and design and execute farther audit processs. The aim is to guarantee that hearers obtain sufficient cognition of the concern of the entity to enable them to place and understand the events. minutess or pattern that may hold a important consequence on the fiscal statements or the audit. This cognition of the concern helps to measure the degrees of control and built-in hazard and to find audit processs. Procedures to follow: †¢ Enquiry of direction†¢ Analytical processs.†¢ Observation and review. Advantages of Risk Assessment†¢ Ensures that attending is focused early on the countries most likely to do material misstatements. †¢ Allows hearer to to the full understand the entity.†¢ Allows the hearer to place unusual minutess or balances every bit early as possible so that these could be addressed in a timely mode. †¢ Permits the audit squad to concentrate on cardinal countries.†¢ Ensure that an experient squad is selected with more experient staff allocated to higher hazard audits and high hazard balances. †¢ Reduces the hazard of an inappropriate audit sentiment being given. †¢ Permits the hearer to hold a good apprehension of the hazards of fraud. money laundering. †¢ Enables the hearer to measure whether the client is a traveling concern. ISA 400 RISK ASSESSMENTS AND INTERNAL CONTROL There are 2 chief classs of hazard 1. Business Hazard2. Audited account Hazard. 1. Business Hazards Business hazard is the hazard that the concern will neglect to run into its aim. Elementss of Business Risk include †¢ Financial hazard which arises from the company activities such as traveling concern jobs. overtrading. recognition hazard. involvement hazard. currency hazard and dislocation of accounting systems. †¢ Operational hazard originating from the operation of the concern such as doomed concern chances. loss of physical assets and deficiency of concern orders. †¢ Conformity hazard originating from non-compliances with Torahs and ordinances such as breach of companies Acts of the Apostless. and wellness and safety ordinances. 2. Audited account hazard is defined as the hazard that the hearer expresses an inappropriate audit sentiment when the fiscal statements are materially misstated. Audited account hazard has two constituents I. Hazards of stuff misstatement ( Financial Statement Risk ) II. Detection Hazard I. Hazard of material misstatement is defined as ‘the hazard that the fiscal statements are materially misstated prior to scrutinize. This consists of two elements built-in hazard and control hazard. Fiscal Statement Risk = Risk of stuff misstatement= built-in hazard + control hazard Built-in hazard is ‘the hazard that an averment about a category of dealing. history balance or revelation could be materially misstated. Built-in hazard is the hazard that misstatement will happen due to factors built-in in the company’s concern or environment or the nature of single dealing or balance. It is the hazard attached to an averment that could do a material misstatement. Certain averments. related categories of minutess and history balances such as stock are more prone to hazard. Built-in hazard depends on the type of concern.The following have a high built-in hazard: †¢ Businesss with merchandises capable to alterations in manner and engineering concern. The hazard is that stock could be overstated. †¢ Companies with a dominant main executive.†¢ Small and new companies.†¢ Companies sing traveling concern jobs.†¢ Companies confronting a extremely competitory environment. Control hazard is the hazard that a misstatement could happen in an history balance or category of minutess and that could be material either separately or when aggregated with misstatement in other balance or category. would non be detected and corrected on timely footing. by the accounting and internal control systems. This is the hazard that the client’s internal control system will non forestall mistakes happening or will non observe them after the happening so that they may be prevented. Example of control hazard – corporate civilization of slack control processs. deficiency of proper rapprochement of leger balances. II. Detection hazard Detection hazard is the hazard that auditor’s substantial processs do non observe a misstatement that exist in an history balance or category of minutess that could be material either separately or when aggregated with misstatements in other balance. One constituent of sensing hazard is trying hazard. Sampling hazard is the possibility that the auditor’s decision. based on a sample. may be different from the decision reached if the full population were subjected to the audit process. Note: Hazards must be related to the hazard originating in the audit of the fiscal statements and should include the fiscal statement averment impacted. Therefore. audit hazards should be related back to relevant averments in the fiscal statements and must province whether the history will be overstated or understated. Measuring Hazard: ISA 330 The auditor’s processs in response to assessed hazards 1. ISA 330 indicates that the hearer must react to the assessed hazard by finding the nature and extent of audit grounds to be obtained from the public presentation of substantial processs in response to the related appraisal of the hazard of material misstatement. This varies depending on the appraisal of built-in and control hazards. and that. irrespective of the assessed hazard of material misstatement. the hearer designs and performs substantial processs for each material category of minutess. history balance. and revelation and that the assessed degrees of built-in and control hazard can non be sufficiently low to extinguish the demand to execute any substantial processs. †¢ Emphasize to the audit squad the demand to keep professional incredulity in assemblage and measuring audit grounds. †¢ Assign more experient staff or those with particular accomplishments or utilizing experts. supplying more supervising. †¢ Make alterations to the nature. timing. or extent of audit processs as an overall response. for illustration. executing substantial processs at period terminal alternatively of at an interim day of the month. In planing farther audit processs. the hearer considers such affairs as the followers: †¢ The significance of the hazard.†¢ The likeliness that a material misstatement will happen.†¢ The features of the category of minutess. history balance. or revelation †¢ involved.†¢ The nature of the particular controls used by the entity and in peculiar whether they are manual or automated. †¢ Whether the hearer expects to obtain audit grounds to find if the entity’s controls are effectual in forestalling. or observing and rectifying. material misstatements. ISA 520 Analytical Procedures Analytic processs are used in obtaining an apprehension of an entity and its environment and in the overall reappraisal at the terminal of the audit. ‘Analytical procedures’ really is the rating of fiscal and other information. and the reappraisal of plausible relationships in that information. The reappraisal besides includes identifying fluctuations and relationships that do non look consistent with other relevant information or consequences. Types of analytical processs Analytic processs can be used as: – Compare information to prior periods to place unusual alterations or fluctuations in sums. – Compare existent or awaited consequences of the entity with budgets and/or prognosiss. or the outlooks of the hearer in order to find the possible truth of those consequences. – Compare to industry information either for the industry as a whole or by comparing to entities of similar size to the client to find whether sensible. Use of analytical processs †¢ Risk appraisal processsAnalytic processs are used at the beginning of the audit to assist the hearer obtain an apprehension of the entity and measure the hazard of material misstatement. Audited account processs can so be directed to these‘risky’ countries. †¢ Analytical processs as substantial processs Analytic processs can be used as substantial processs in finding the hazard of material misstatement at the averment degree during work on the income statement and statement of fiscal place ( balance sheet ) . †¢ Analytical processs in the overall reappraisal at the terminal of the audit Analytical processs help the hearer at the terminal of the audit in organizing an overall decision as to whether the fiscal statements as a whole are consistent with the auditor’s apprehension of the entity. ISA 320 AUDIT MATERIALITY Hearers must see materiality and its relationship to audit hazard when conducting and audit. Information is material if its skip or misstatement could act upon the economic determinations of users taken on the footing of the fiscal statements. Misstatements. including skips. are considered to be material if they could moderately be expected to act upon the economic determinations of users. Materiality is an of import construct in the audit procedure and affects: †¢ Audit hazard rating†¢ The nature. timing and extent of audit processs ( e. g. sample sizes ) . †¢ The finding of whether the fiscal statements are distorted by misstatements discovered. The auditor’s appraisal of materiality is influenced by the followers: †¢ The overall impact on the fiscal statements. A materiality degree for the fiscal statements as a whole. †¢ Individual history balances and minutess†¢ Performance materiality. An sum or sums lower than themateriality degree for the fiscal statements as a whole. It is the sum set by the hearer to cut down the chance that the sum of uncorrected and undetected misstatements exceeds materiality for the fiscal statements as a whole. Performance materiality Performance materiality is set to cut down the chance that the sum of uncorrected and undetected misstatements in the fiscal statements exceeds materiality for the fiscal statements as a whole ISA 320 defines public presentation materiality as 1. The sum ( s ) set by the hearer at lower ( smaller ) than the materiality for the fiscal statements as a whole to cut down the chance that the sum of uncorrected and undetected misstatements exceeds materiality for the fiscal statements as a whole to an suitably low degree 2. Performance materiality besides refers to the sums set a less than materiality for the fiscal statements as a whole when sing peculiar categories of dealing. history balances or revelations. Examples:Materiality for fiscal statements as a whole. of ?90. 000 Sum of identified but uncorrected misstatements ? 40. 000 Sum of expected ( unidentified mis-statements ) ? 30. 000 ? 70. 000Lower of ? 90. 000 and ? 70. 000= ? 70. 000 The hearer should put materiality for the fiscal statements as a whole AND should besides set up an sum set at less than materiality when planing the nature. timing and extent of farther audit processs. This will assist to cut down the hazard that misstatements in aggregative exceed the entire for materiality for the fiscal statements as a whole. Determination of materiality requires the exercising of professional opinion. ISA 315 Assertions – Representations or statements made by direction andincluded in the fiscal statements SIX Assertions about categories of minutess and events ( Statement of Comprehensive Income points ) 1. Happening: A fiscal or non fiscal dealing occurred/ took topographic point during the accounting period. 2. Completeness: all minutess of gross revenues and disbursals that took topographic point are recorded in the statement of comprehensive income. 3. Accuracy: the minutess are recorded at the right sums. 4. Cut-off minutess have been recorded in the right accounting period 5. Categorization: the minutess have been recorded in the proper histories. 6. Presentation and revelation: all minutess are presented and disclosed in conformity with the relevant fiscal coverage model. FIVE Assertions about history balances in the Statement of Financial Position 1. Being: an plus and liability exists at balance sheet day of the month. ( The key aim is that assets are non overstated and liabilities are non understated ) . 2. Completeness: all assets and liabilities have been recorded. 3. Rights and duty ( Ownership ) : The company has the rights to utilize the plus and is obligated to refund the liabilities. 4. Assertions about rating: The assets and liabilities are recorded at an appropriate value. For all non current assets this would be initial cost plus additions or subtractions decreased in value. 5. Assertions about presentation and revelations: Must be in conformity with relevant national statute law and accounting criterion. The auditor’s appraisal of the identified hazards at the averment degree provides a footing for sing the appropriate audit attack for planing and executing farther audit processs. The response must utilize: 1. Trial of controls/ conformity trials In some instances. the hearer may find that merely by executing trials of controls will he accomplish an effectual response to the assessed hazard of material misstatement for a peculiar averment. Trials of control are an audit process designed to measure the operating effectivity of controls in forestalling. or observing and rectifying. material misstatements at the averment degree. The hearer designs trials of controls to obtain sufficient appropriate audit grounds that the controls operated efficaciously throughout the period of trust. Matters the hearer may see in finding the extent of the auditor’s trials of controls include the followers: †¢ The frequence of the public presentation of the control by the entity during the period. †¢ The length of clip during the audit period that the hearer is trusting on the operating effectivity of the control. †¢ The relevancy and dependability of the audit grounds to be obtained in back uping that the control prevents. or detects and corrects. stuff misstatements at the averment degree.†¢ The extent to which audit grounds is obtained from trials of other controls related to the averment. 2. Substantial Procedures. If the hearer determines that executing merely substantial processs is appropriate for specific averments. he can except the consequence of controls from the relevant hazard appraisal. This may be because the auditor’s hazard appraisal processs have non identified any effectual controls relevant to the averment. or because proving the operating effectivity of controls would be inefficient. However. the hearer needs to be satisfied that executing merely substantial processs for the relevant averment would be effectual in cut downing the hazard of material misstatement to an tolerably low degree. Often the hearer may find that a combined attack utilizing both trials of the operating effectivity of controls and substantial processs is an effectual attack. Substantial process – An audit process designed to observe material misstatements at the averment degree. Substantial processs comprise trials of inside informations and substantial analytical processs. ( I ) Trials of inside informations ( of categories of minutess. history balances. and revelations ) . and ( two ) Substantive analytical processs. Trials of item are appropriate for affairs identified as important hazards. These include composite or unusual minutess which make indicate fraud or other particular hazards. Interim Audited account: In some fortunes. the hearer may find that it is effectual to execute audit processs at an interim day of the month before twelvemonth terminal Trial of Controls at interim phase:When the hearer obtains grounds about the operating effectivity of controls during an interim audit. the hearer should find what extra audit grounds should be obtained for the staying period. Substantial Audited account Procedures at interim phase ( a ) Identify sums that appear unusual( B ) Investigate any such sums( degree Celsius ) Perform substantial analytical processs or trials of inside informations to prove the interim period. Performing substantial processs at an interim day of the month without set abouting extra processs at a ulterior day of the month addition the hazard that the hearer will non observe misstatements that may be at the period terminal. Documentation at planning phase The signifier and extent of audit certification is a affair of professional judgement. and is influenced by the nature. size and complexness of the entity and its internal control. handiness of information from the entity and the audit methodological analysis and engineering used in the audit. Must document the followers: †¢ Audit Strategy†¢ Key elements of the entity†¢ Identified or assessed hazard of material misstatement †¢ Responses to turn to hazard†¢ Nature. extent. timing of processs.†¢ Decisions ISA 402 Audit Considerations Relating to an Entity Using a 3rd party Service Organisation. Third party service organisations are companies that provide outsourcing services that impact the control environment of their clients. Example of 3rd party service organisations: A client may utilize a service organisation such as one that records minutess and procedures related informations such as a computing machine systems service organisation. If the entity uses a service organisation. certain policies. processs and records maintained by the service organisation may be relevant to the audit of the fiscal statements of the client. ISA 402 is applied when the hearer intends to utilize a service auditor’s study as audit grounds. If the hearer concludes that the activities of the service organisation are important to the entity and relevant to the audit. the hearer should obtain a sufficient apprehension of the service organisation and its environment. including its internal control. to place and measure the hazards of stuff misstatement and design further audit processs in response to the assessed hazards If the hearer uses a service organisation auditor’s study. the hearer should see the nature of and content of that study. There are two types of service hearer studies: Type I service auditor’s study is a study merely on the description and design of controls at a service organisation. Type 2 service auditor’s study is a study on the description. design. and runing effectivity of controls at a service organisation When executing hazard assessment the hearer should execute the undermentioned processs to guarantee that the service organisation’s controls are runing efficaciously: †¢ Obtain a Type 2 study. if available. prepared by hearers of the service administration. †¢ Obtain a sensible confidence study by the service hearer †¢ Perform trials of control at the service administration †¢ Use another hearer to execute trials of control at the service administration on their behalf. If the hearer intends to utilize a study from a service hearer they should execute processs to guarantee they are satisfied with the competency and independency of the service hearer and that the service auditor’s study provides sufficient appropriate grounds about the effectivity of controls. ISA 620 – USING THE WORK OF AN EXPERT â€Å"Expert† means a individual or house possessing particular accomplishment. cognition and experience in a peculiar field other than accounting and scrutinizing. An expert may be:( a ) Engaged by the entity ;( B ) Engaged by the hearer ;( degree Celsius ) Employed by the entity ; or( vitamin D ) Employed by the hearer. When the hearer uses the work of an adept employed by the hearer. that work is used in the employee’s capacity as an expert instead than as an helper on the audit. The hearer should obtain sufficient appropriate audit grounds that the range of the expert’s work is equal for the intents of the audit. An expert’s work can be used: †¢ At the planning phase to obtaining an apprehension of the entity and executing farther processs in response to assessed hazards. †¢ During the audit to obtain audit grounds in the signifier of studies. sentiments. ratings and statements of an expert. The hearer needs to measure 4 issues in relation to an expert: 1. Necessity to utilize him2. Competence and objectiveness – is he an employee or a contracted 3rd party. 3. Scope of work of the expert.4. Actual work. See the beginning informations used. premises. methods and consequences. The consistence of the findings with other grounds ; the important premises made ; and the usage and truth of beginning informations. Before utilizing an expert the audit shall hold. in authorship: †¢ The functions and duties of the hearer and the expert †¢ The nature. range and aims of the expert’s work. †¢ The nature. timing and extent of communicating between the two parties. †¢ The demand for the expert to detect confidentiality. Mention to an Expert in the Auditor’s Report 1. When publishing an unqualified study. the hearer should non mention to the work of an expert. Such a mention might be misunderstood to be a making of the auditor’s sentiment or a division of duties. 1. If as a consequence of the work of an expert. the hearer decides to publish a qualified audit study. it may be appropriate to mention to or depict the work of the expert ( including the individuality of the expert and the extent of the expert’s engagement ) . In these fortunes. the hearer would obtain the permission of the expert before doing such a mention. If permission is refused and the hearer believes a mention is necessary. the hearer may necessitate to seek legal advice. 2. If the hearer makes mention to the usage of an expert in the audit study. the hearer the hearer shall bespeak that the mention to the expert does non cut down the auditor’s duty for the sentiment.

How To Choose The Best Anthem Essay Topics

How To Choose The Best Anthem Essay TopicsWith so many different anthem essay topics to choose from, how can you be sure which ones are the best? For starters, an anthem essay topic should appeal to you and your audience. You want to feel that you have accomplished something when you write and you want to feel that the work that you have produced is valuable and will speak to your audience.That means choosing the right topic for your project. Can you do that in a matter of minutes? Can you create a research report on a topic that you know you will love to read? If you are not familiar with a topic, but feel that you can find out more information on it, by all means, get started.Even if you have some ideas about what kind of topics you would like to write about, you will probably find that you end up writing a topic that you have never heard of before. That is okay. It does not mean that you are stuck with it. After all, you could spend the rest of your life trying to find a topic for your essay topic.Remember that you have unlimited resources. You do not have to spend hours searching for the right topics to use in your assignment. You may still get your assignment done.When you come up with a topic for your essay, make sure that you really feel that it is the right one. Is it something that has been done before? Are there any terms that you cannot pronounce or words that you do not know?Do not forget that you have every right to write about whatever you want and no one else's personal opinions will stop you. Just because you do not agree with something does not mean that you have to let someone else dictate how your essay will be presented.The most important thing to remember when choosing your topic is that you should not let yourself be influenced by the crowd. Everyone else in the world has the same goals as you do.

Is Feminism Harmful Essays - Social Philosophy, Philosophy Of Life

Is Feminism Harmful? PART B- IS FEMINISM A HARMFUL IDEOLOGY? Describe two central moral issues. In Issue 4, Is Feminism a Harmful Ideology? I believe that the two central moral issues to this debate are as follows : (1) Is it immoral to infringe upon individual liberty (even if some other good can come of it)? (2) Is it immoral to discriminate based on sex (even if there are innate differences, which are relevant to the situation)? What makes these distinctly moral issues, as opposed to legal, religious, or socio-political issues? These are distinctly moral issues for a few reasons. First, answers to these questions require normative statements (yes it is immoral, or no it isn't immoral to infringe?) which express value judgements. These statements can not be supported by empirical evidence. In other words, they are not subject to verification by running experiments, or through observation. Second, these answers define standards of human conduct, which apply equally to everyone (as opposed to, for example, men under the age of 21 who live in Tanzania). Lastly, these judgements for the most part are, as the course guide vaguely puts it, not laid down by authoritative bodies (pg.1-3) . What is the liberal position concerning the enforcement of morality? The liberal position concerning the enforcement of morals holds freedom as the most important value in cases of victimless crime. The liberal believes that it is cruel and unjust for authoritative bodies to enforce community moral standards for victimless crime because of the necessary restraint it puts on individual civil liberties. Normative Ethics: Normative ethics is a branch of ethics which attempts to illuminate how humans should live their lives, and more specifically how to make moral decisions concerning oneself and others, according to certain sets of values. The following moral theories are components of normative ethics. Application of moral theories to Feminism and Freedom Act Utilitarianism: Act utilitarianism judges the morality of an act according to how much utility it produces. In this case, utility refers to an end or consequence. A morally sound act has utility, meaning that its end is a positive one. The act that produces the most happiness is considered the morally right one. An act utilitarian who believes that feminism is a harmful ideology might argue that yielding to feminist's beliefs would produce less happiness than rejecting them. S/he may argue that forcing equality by, for example, requiring fire departments to establish less demanding physical examinations for women, or requiring corporations to exercise gender quotas may cause more unhappiness. Taken another step, if a fire-fighter's effectiveness rests to a certain extent on his physical strength, then would it be so far-fetched to suggest that inevitably lives will be lost because of the inability of certain fire-women to carry an unconscious person up from the basement of a burning house? According to this reason, an act utilitarian may view feminism as a harmful ideology. Rule Utilitarianism: A rule utilitarian seeks underlying moral rules of particular acts, and judges their morality by finding which rules produce the most utility. In the issue of whether feminism is a harmful ideology or not, a rule utilitarian would find the underlying moral rules on each side of the debate. S/he may feel that the underlying moral rules in Michael Levin's Feminism and Freedom are: -One should not infringe upon individual liberty -One should not discriminate based on sex The rule utilitarian may feel that there is more utility to be gained by following the first rule. This is a value judgement that may not be held by all rule utilitarians, but in this particular utilitarian's view, it is the rule that produces the most happiness. Kantian View: The Kantian theory of ethics maintains that there is a universal moral principle of duty. The moral duty performed is what is judged, not the consequence of carrying out the duty. For example, a Kantian theorist may believe that stealing is wrong. For him/her, this is a categorical imperative to be followed at all times by everyone; even if what is being stolen is a piece of bread to feed a starving child. Kantian theory applied to the question of feminism may produce the view that securing individual freedom is the most important value, and since feminism infringes upon freedom, it is the

Most Beautiful Mountain Biking Trails

Most Beautiful Mountain Biking Trails The exciting mountain biking trails in the U.S. can turn any bike ride into an adventure. Many of the biking trails on this list are on the wish list of experienced cyclists from all over the world. From very fast downhill trails that can take your breath away to buttery smooth single-track trails, there is a challenge out there for every cyclist. The San Juan Islands, Washington What will strike you about the biking trails in San Juan Islands, Washington is the wide range of beaches and attractions you can discover along the way. The San Juan Islands welcome cyclists of all levels, which means you do not have to be a pro to enjoy the surprising sceneries these trails have. It can take you about a day to go around the island of San Juan on a trail that is 43 miles long. The amazing parks and beaches along the way may tempt you to spread the trip over a couple of days, though. If you are an experienced cyclist, head to the horseshoe-shaped Orcas Island, often referred to as the gem of the San Juans. The mountain bike trails on the 57 square miles area of the island offer a great mix of high mountains and fabulous shoreline. The trails here can be a challenge for most cyclists and at the same time they can discover some great landscapes that are sure to impress their Facebook followers. Poison Spider Mesa Trail, Moab, Utah The infamous Poison Spider Mesa Trail is not for the faint-hearted, as it will be a struggle to get to the end of it and still feel your legs. Even though cyclists have to share the trail with motorcycles and jeeps, most of the time you will be all by yourself while navigating past the high Wingate sandstone cliffs along the Colorado and higher up onto the Navajo mesa. The views of the La Sal Mountains and Behind the Rocks area make this trail one of the most scenic ones in the U.S. Despite its name, there are no poisonous spiders here, but you are sure to stumble upon some fun rock obstacles on the Poison Spider Mesa Trail. When it comes to the road surface, much of the loop is on Navajo Sandstone, but youll also speed over sandy wash bottom, two blow-sand hills, and rock ledges. Munds Wagon Trail, Sedona, Arizona A former main cattle route North out of town, Munds Wagon is nowadays a trail that closely follows Schnebly Hill Road and Bear Wallow Creek. Cyclists choosing this trail can discover the exciting sensation of riding across a canyon. When you reach the top of the trail, you get access to the Cow Pies and Merry-Go-Round Rock. The Munds Wagon Trail climbs 1100 feet and features lots of mini obstacles that make the ride fun, as well as some fast sections for those who are in for a bit of adrenaline. After the first loose section, the trail smoothes out as it you start going downhill, so you enjoy the scenic views at the fullest. Tahoe Rim Trail, California, Nevada Passing through no less than six counties in California and Nevada, the Tahoe Rim Trail will also take you through three wilderness areas, three national forests, and one state park. A spectacular trail with 165 miles of single-track, the Tahoe Rim Trail goes around all of Lake Tahoe. Overlapping with about 50 miles of the Pacific Crest National Scenic Trail, this trail touches other legendary rides as well, including the Flume Trail to the east and Hole in the Ground near Truckee to the northwest. Biking on the Tahoe Rim Trail allows you to discover the carving that goes across a remarkable terrain. The trail is open to riders and hikers as well, but for the most part you will find yourself all alone to make the most of the incredible sceneries. Paradise Royale Trail, California Discover the wilderness of Northern California on the Paradise Royale Trail. Taking you across remote backcountry and bringing a sense of peacefulness with it, the Paradise Royale Trail is a beautiful single track built for mountain biking. Boasting a 14-mile loop, this trail is challenging and mostly suitable for experienced cyclists. The climbs here are tough, so get ready for a tough workout. The trail is located deep in the King Range Mountains and was specifically designed as a mountain bike trail. Starting with a slope and then changing into a hill, the trail is as rewarding as it is beautiful. As you get to the end of the trail, you can enjoy the striking panorama of the Pacific Ocean below.