Aerial telegraph: ancient Roman signal towers, c1900. A basket containing fire was hung from an arm near the top of the tower and used to signal a message to the next tower in a chain. The message was then passed along the to the next in the chain of similar towers. Trade card for Liebig Meat Extract. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Heritage Images / Ann Ronan Picture Library |
Bildgröße: | 5102 px × 3420 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |