A simple telephone system with cups and string.

A simple telephone system with cups and string.

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Credit: SCIENCE PHOTO LIBRARY

Caption: Cups and string. Engraving of a man and woman using a simple telephone system comprised of two cups and a length of string. When one person speaks into a cup, the notes in the voice will cause pressure waves in the air. If the string is held taut, these pressure waves will be transmitted along the string to the other cup. Another person can then hear the first person's voice. Image from the 19th century.

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Keywords: communication, communications, cups and string, historical, history of science, string and cups, technology, telecommunication, telecommunications, telephone

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