Siemens telephone
The Siemens telephone is an electroacoustic telephone developed by Werner von Siemens based on the model by Alexander Graham Bell from 1877.
functionality
In the case of the Siemens telephone, ee is the horseshoe magnet , the poles of which are attached to dd . These are enclosed in two induction coils cc and can be brought closer to the iron membrane gg as desired by means of an adjusting screw f .
b is the mouthpiece , a is the detachable whistle . By means of this whistle , the effectiveness of which is reinforced by a metal clapper resting on the membrane and vibrating with it, a widely audible tone can be generated in the receiving device, whichmakesany other call by means of electric batteries or inductors unnecessary.
Because of its powerful effect, which makes it equally suitable for use as a sending and receiving device, the Siemens telephone has found widespread use and was used exclusively in the German Reich Telegraph Administration at the end of the 19th century.
See also
literature
- Grawinkel: Textbook of Telephony and Microphone (2nd edition). Berlin 1884
- Wietlisbach: Telephony technology . Vienna 1886