Double-current telegraph key, 1830-1900
- Made:
- 1830-1900 in United Kingdom
- maker:
- General Post Office
This image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
This image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
This image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
This image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Double-current telegraph key, probably made and used by the Post Office, British, 1830-1900.
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. This example is similar to those used with the Bright's bell, or acoustic telegraph.
On display
Science Museum: Information Age Gallery: Cable
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Details
- Category:
- Telecommunications
- Object Number:
- 1953-111
- Materials:
- copper (alloy), metal (unknown), mother-of-pearl and wood (unidentified)
- type:
- telegraph
- taxonomy:
-
- component - object
- credit:
- Donated by the Institution of Electrical Engineers
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Data in the title, made, maker and details fields are released under Creative Commons Zero
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