Telegraph dial mechanism. 19th-century artwork of the mechanisms used in an electric telegraph with a rotating dial,with some letters of the alphabet shown. Electric telegraphy was developed by several inventors in the 1830s and 1840s. This artwork is from 'Der Elektromagnetische Telegraph in den einzelnen Stadien seiner Entwicklung' (The Electromagnetic Telegraph in the Various Stages of its Development,1850) by German author Heinrich Schellen (1818-1884) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / King's College London |
Bildgröße: | 5010 px × 3519 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |