Portable double-needle telegraph and test set, 1850

Made:
1850 in United Kingdom
maker:
Unknown

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Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

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Portable twin needle telegraph terminal. Detail view of terminals on back of unit.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable twin needle telegraph terminal. Detail view of face.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable twin needle telegraph terminal. General three quarter view. Grey background
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable twin needle telegraph terminal. General three quarter view. Grey background
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable double-needle telegraph and test set, with removable wooden cover, unknown maker, possibly British, 1850.

This small instrument is both a telegraph instrument and a test set. It was compact enough to be carried by the telegraph lineman when inspecting and repairing telegraph wires. It worked using two pairs of press-buttons at the back of the case. When the instrument was required to work as a galvanometer (an instrument for detecting electric currents), a lever inside the case withdraws the needle stops, allowing the needles to swing fully across the dials. With the ivory stops in position the needles were used to send and receive messages using the standard double-needle code.

On display

Science Museum: Information Age Gallery: Cable

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Details

Category:
Telecommunications
Object Number:
2004-123
type:
telegraph, electric
taxonomy:
credit:
Donated by BT Heritage and Archives
status:
Permanent collection

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