Telephone Receivers, 19th Century

Numéro d’image : 12626629
Telephone Receivers, 19th Century
A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user. The essential elements of a telephone are a microphone (transmitter) to speak into and an earphone (receiver) which reproduces the voice in a distant location.
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Crédit: Science Photo Library / Science Source
Taille de l’image : 3750 px × 3645 px
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