Bell's Telephone Transmitter, 1876

Numéro d’image : 12652179
Bell's Telephone Transmitter, 1876
Historical artwork of Alexander Graham Bell's first telephone transmitter. Patented in 1876, it used existing telegraph lines to transmit and receive sound. The mouthpiece (far left) doubled as the earpiece for the call's receiver, but this two way system was later improved as it was not practical to speak and listen concurrently. Bell was born in Scotland in 1847, emigrating to Massachusetts, USA, where he worked on a system to teach deaf mutes to speak. He also patented a system to send more than one message at a time along existing telegraphic systems. It was this improvement that lead him to invent the telephone.
Licence : Droits gérés
Crédit: Science Photo Library / Science Source
Taille de l’image : 3000 px × 1747 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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