Carbon microphone, 1882. Device invented in 1878 by David Edward Hughes (1831-1900), English inventor. From Physics in Pictures by Theodore Eckardt. (London, 1882). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Heritage Images / Oxford Science Archive |
Bildgröße: | 3394 px × 5148 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |