Early field telephone

Early field telephone

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Early field telephone. Historical artwork of a 19th century field telephone. Telephone technology was developed by Alexander Graham Bell by 1876. It revolutionised communications, allowing the direct transmission of voices. It eventually replaced the telegraph, and the use of batteries (centre left) allowed a portable version to be used in the field (usually during a war) if it could be connected by wire to a telephone or telegraphy network. An incoming call triggers the ringing of the bells (lower left), and the headset (upper centre) is used to talk and listen to the caller. From La Telegraphie Historique (Alexis Belloc, 1888).

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Keywords: 1800s, 1888, 19th century, apparatus, artwork, audio, aural, battery-operated, belloc, coloured, communication, communications, device, early, electrical, equipment, field, headphone, headphones, headset, historical, history, illustration, la telegraphie historique, machine, mobile, phone, portable, sound, technological, technology, telecommunication, telecommunications, telephone, telephony, voice

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