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Acoustic Telephone Device

Acoustic Telephone Device
Willard Henderson USA, 1881 y.

Acoustic Telephone Device 1881, USA, Willard Henderson The device was used over short distances between private houses and offices. The patent for this device was received on 8th March 1881. Electricity was not needed to operate an acoustic telephone device. It worked in the following way: a wire was stretched between two telephones. Sound (the voice) was passed through this wire using vibrations. To call another person, one had to press a clip on the back panel of the telephone. This clip would hit a diaphragm and, as a result, tapping could be heard at the other end of the telephone. This meant you are being called! The device was used at short distances between private houses and offices.