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Telephone Receivers, 19th Century

Telephone Receivers, 19th Century

C030/4143

Rights Managed

39.1 MB (2.5 MB compressed)

3750 x 3645 pixels

31.8 x 31.0 cm ⏐ 12.5 x 12.2 in (300dpi)

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Credit

SCIENCE SOURCE / SCIENCE PHOTO LIBRARY SCIENCE SOURCE / SCIENCE PHOTO LIBRARY

Caption

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.

Release details

Model release not required. Property release not required.

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