Lesage experimenting with the first electric telegraph, Geneva, 1774 (1876). George Louis Lesage (1724-1803), Swiss scientist, devised an early form of electric telegraph. It had a separate wire for each letter of the alphabet and a range limited to the distance between two rooms in Lesage's home. From Les Grandes Inventions (The Great Inventions) by Louis Figuier. (Paris, 1876). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Heritage Images / Ann Ronan Picture Library |
Bildgröße: | 5409 px × 3230 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |