| Hydraulic semaphore, illustration. Aeneas the tactician and his hydraulic semaphore (IVth century. B. C. ). Engraving in: Les Merveilles de la Science (The Wonders of Science), by Louis Figuier, France, 1868. | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / CCI Archives |
| Taille de l’image : | 3621 px × 4826 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |