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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Charmet, Jean-Loup |
Taille de l’image : | 2650 px × 3543 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |