On December 7, 1877 Thomas Edison demonstrated his phonograph at the New York City offices of the nation's leading technical weekly publication, Scientific American. The following report set off ...
Once the basic principle of the phonograph was discovered, the years of arduous work on its development by Edison and others dealt largely with the composition and handling of materials for ...
The component in a phonograph turntable that holds the stylus, which is a needle attached to a cantilever arm. The vibrations of the stylus are transferred into electrical energy by a magnet ...