This image is released under a CC BY-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseBranly tripod coherer, probably made by Edouard Branly, France
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Branly tripod coherer, probably made by Edouard Branly, France, 1900-1910.
Edouard Branly devised the filings coherer in about 1890 but did not use it for detecting Hertzian waves. After wireless telegraphy had been developed for practical purposes in the late 1890s, Branly invented a new form of imperfect-contact detector. The steel tripod rests on a polished steel plate. The feet are slightly oxidised, producing the imperfect contact required for detection.
Details
- Category:
- Radio Communication
- Object Number:
- 1924-606
- Materials:
- metal (unknown) and copper (alloy)
- Measurements:
-
overall: 28 mm x 32 mm diameter, .056 kg
- type:
- coherer
- credit:
- Donated by Professor E. Branly
