Edison and his phonograph. Thomas Alva Edison (1847-1931,centre),US inventor,operating his favourite invention,the phonograph. This machine was used to record and play back sounds. Turning the handle moved a foil-wrapped cylinder past a needle. Sound was transmitted by a receiving device attached to the needle,causing the needle to vibrate and leave a trace on the foil. A sound amplifier was then attached to the receiver,the needle was placed at the beginning of the trace,and the cylinder was rotated to produce distorted but recognisable sounds. Edison was a prolific inventor,filing some 1300 patents | |
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Credit: | Science Photo Library / NEW YORK PUBLIC LIBRARY / HUMANITIES & SOCIAL SCIENCES LIBRARY |
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