Morse key with send-receive switch, 1900-1920

Made:
1900-1920 in United Kingdom
maker:
General Post Office

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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 

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

Morse key with send-receive switch, made by the General Post Office, UK, c. 1910. SCM - Telecommunications.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Morse key with send-receive switch, made by the General Post Office, UK, c. 1910. SCM - Telecommunications.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Morse key with send-receive switch, made by the General Post Office, UK, c. 1910. SCM - Telecommunications.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Morse key with send-receive switch, made by the General Post Office, UK, c. 1910. SCM - Telecommunications.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Morse key with send-receive switch, made by the General Post Office, British, 1900-1920.

With a single-current telegraph key the position of the relay is restored to the normal position when current ceases by a magnetic bias or by a spring in tension. In other words, signal currents only flow in the line when the key is depressed. In the double-current system a current in the reverse direction is used to restore the relay to the spacing side. The 'send-receive' switch is necessary to disconnect the key from line while signals are being received, otherwise a spacing current flows along the line, preventing signals from being sent from the other end.

On display

Science Museum: Information Age Gallery: Cable

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Details

DisplayLocation:
Science Museum, Information Age Gallery: Cable
Category:
Telecommunications
Object Number:
1953-112
Materials:
brass (copper, glass, plastic (unidentified), steel (metal), wood (unidentified), zinc alloy)
type:
telegraph
taxonomy:
  • component - object
credit:
Donated by the Institution of Electrical Engineers
status:
Permanent collection

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