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History
Tin can telephone
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A tin can phone is a type of acoustic (non-electrical) speech-transmitting device made up of two tin cans, paper cups or similarly shaped items attached to either end of a taut string or wire.
Fig 7 Le Telephone by T du Moncel Paris 1880 (Large)
Fig 7 Le Telephone by T du Moncel Paris 1880 (Large)
An 1886 advertisement for an acoustic telephone
An 1886 advertisement for an acoustic telephone
An example of using a twisted loop to direct the string of a can phone into a new direction
An example of using a twisted loop to direct the string of a can phone into a new direction
Speaking tube
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A speaking tube or voicepipe is a device based on two cones connected by an air pipe through which speech can be transmitted over an extended distance.
A speaking tube in use on a United States Navy Landing Craft Utility (2005)
A speaking tube in use on a United States Navy Landing Craft Utility (2005)
Le Petit Journal, 21 August 1910. French air-force ready to deter hostile advances along the eastern frontier, and equipped with intercom - two speaki
Le Petit Journal, 21 August 1910. French air-force ready to deter hostile advances along the eastern frontier, and equipped with intercom - two speaking tubes for full duplex send and receive.
British warship officer with mounted binoculars and two speaking tubes
British warship officer with mounted binoculars and two speaking tubes
An office in 1903, showing speaking tubes hanging on the end of a desk
An office in 1903, showing speaking tubes hanging on the end of a desk