An illustration showing the telegraph station at the Louvre,part of the optical relay semaphore system pioneered by Claude Chappe in France in 1792. This mechanical signalling system was a fore-runner of the electric telegraph | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Charmet, Jean-Loup |
Bildgröße: | 2650 px × 3543 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |