Radio valve of Clearton valve type.

Whicher, Adrian

 
Radio valve of Clearton valve type.
4 0 c m
 
32cm
actual image size: 24cm x 32cm

Description

Lee de Forest (1873-1961) was an American electrical engineer and inventor. In 1907, while working for the Western Electric Company, he patented the thermionic triode, or radio valve. Esentially a diode with an additional electrode between the cathode and the anode, the triode was able to amplify weak electrical signals, making it a crucial invention for the development of radio. For 50 years, radio receivers relied on valves, until being generally replaced by the transistor from the 1950s.

Image Details

Artist
 
Image Ref.
 
10305476

© Science Museum / Science & Society Picture Library

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