Edison cylindrical phonograph
Numéro d’image : 11904436
| Edison phonograph. Engraving of a battery-powered cylindrical phonograph from the 1870s. It consists of a foil wrapped on a cylinder (at upper right). To make a recording,a free-floating needle was skimmed over the foil which was revolved by an electric motor (at centre) powered by a battery (at left). The needle was connected to a sound receiver (at right). The needle vibrated in time to the sound waves and made etchings in the foil. If a sound horn was attached,this etching could then be used to play back a distorted but recognisable recording of a person's voice. Thomas Alva Edison (1847-1931) devised the phonograph in 1877 and it was his favourite invention | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library |
| Taille de l’image : | 3543 px × 2443 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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