Telegraphy sending station,engraving from 1880. The operator is tapping out a message on an electric transmitter. Electric telegraphy was developed in the mid-19th century. Information was transmitted by wire or radio waves,using a set of coded signals such as the Morse code. Early receivers employed a stylus controlled by an electromagnet. The stylus imprinted code onto a strip of paper in response to the signal being transmitted | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Bildagentur-online / Tschanz |
Taille de l’image : | 3375 px × 5199 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |