Marconi coherer and Admiralty pattern decoherer, 1900-1910
- Made:
- 1900-1910 in United Kingdom
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
License
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
Early Marconi coherer and Admiralty pattern decoherer, 1900. Three quarter rear view on graduated grey background. From
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Early Marconi coherer and Admiralty pattern decoherer, 1900. Side view on graduated grey background. From a colour
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Early Marconi coherer and Admiralty pattern decoherer, 1900. Oblique three quarter rear view on graduated grey
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Marconi coherer and Admiralty pattern decoherer, unknown maker, British, 1900-1910
The coherer was the first practical device for detecting Hertzian waves. Its most familiar form was a tube containing metal filings or turnings loosely packed between metal plugs. This presented a high resistance to current but changed to low resistance in the presence of electric waves because the filings 'cohered' or stuck together. In order to restore the high-resistance state the tube needed to be given a mechanical tap or jolt. Filings coherers were fitted with clockwork or other arrangements for driving a 'tapper' to provide continual mechanical agitation. Marconi brought the coherer to its most efficient form and it was used with receiving sets in wireless telegraphy equipment used by the Royal Navy.
Details
- Category:
- Radio Communication
- Materials:
- brass (copper, zinc alloy), copper (alloy), ebonite, glass, paint, plastic (unidentified), steel (metal) and wood (unidentified)
- Measurements:
-
overall: 115 mm x 100 mm x 170 mm, 1.07 kg
- Identifier:
- 1923-396
- type:
- coherer
- taxonomy:
-
- component - object
- radio receiver
- credit:
- Donated by M Child
