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Technology to Overcome The Limitation of Sight and Hearing
艾 迪on 2 April 2013
Transcript of Technology to Overcome The Limitation of Sight and Hearing
Lim Ai Di
Ng Ying Ying Technology to Overcome The Limitation of Sight and Hearing Introduction Devices to overcome Limitations of sight Microscope Binoculars Function:
Binoculars are used for viewing far objects like buildings, birds, and much more. Other information related to the devices Telescope
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, Zacharias Janssen and Jacob Metius. Binoculars
The telescope was introduced to astronomy in 1609 by the great Italian scientist Galileo Galilei. Periscope
In 1854 Hippolyte Marié-Davy invented the first naval periscope, consisting of a vertical tube with two small mirrors fixed at each end at 45°. Simon Lake used periscopes in his submarines in 1902. Stethoscope
The stethoscope was invented in France in 1816 by René Laennec at the Necker-Enfants Malades Hospital in Paris. It consisted of a wooden tube and was monaural. Megaphone
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. Sight Limitations Hearing Limitations Limitation of sight is whereby a person is able to see an object/colour/shape until a certain extend. Limitations of sight can be overcome by using appropriate optical devices such as Microscope , Telescope , Periscope and others. The range of frequency of hearing in human is from 20 Hz to 20000Hz. It is different according to the age of a person. Limitation of hearing can be overcome by using appropriate hearing aids such as microphone, stethoscope, amplifier and others. Function:
A microscope is an instrument used to see objects that are too small for the naked eye. Telescope Function:
A telescope is used for viewing distant objects like stars, planets, the moon and others. Periscope Function:
A periscope is an instrument for observation from a concealed position. Devices to overcome the Limitations of Hearing Microphone Function:
A microphone is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. Stethoscope Function:
The stethoscope is an acoustic medical device for auscultation, or listening to the internal sounds of an animal or human body. Megaphone Function:
A megaphone is a portable, usually hand-held, cone-shaped acoustic horn used to amplify a person’s voice or other sounds and direct it in a given direction. Microscope
An early microscope was made in 1590 in Middelburg, Netherlands.Giovanni Faber coined the name microscope for Galileo Galilei's compound microscope in 1625. Microphone
Both Thomas Alva Edison and Emile Berliner filed patent applications for the carbon microphone, in March and June 1877 respectively. Conclusion
The limitations of sight and hearing can be overcome by using certain devices. Thank You !