Model of Bell's telephone of 1875

Bildnummer 12099861
Model of Bell's telephone of 1875
Model of Bell's telephone of 1875. The display plate states that this is a duplicate of the instrument through which speech sounds were first transmitted electrically,1875. This was the prototype telephone constructed by Alexander Graham Bell in 1875. It consisted of a coil of wire,a magnetic arm and a taut membrane. Any sound causes the membrane,and hence the magnetic arm,to vibrate. The movement of the magnet induced a fluctuating electric current in the coil,and this electrical signal was reconverted into sound by an identical apparatus at the other end of the circuit. This photograph,from the Detroit Publishing Company,date from between 1915 and 1925
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Library of Congress
Bildgröße: 5215 px × 4028 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
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