Fleming's oscillation valves, c 1903.
3 3 c m
40cm
actual image size: 32cm x 25cm

Fleming's oscillation valves, c 1903.

© Science Museum / Science & Society Picture Library

Description

As well as being a pioneer in the application of electricity to lighting and heating on a large scale, John Ambrose Fleming (1849-1945) invented the thermionic diode or valve. His invention was a major step forward in wireles technology as it was considerably more efficient as a radio wave detector than coherers or magnetic detectors. Valves became fundamental components in radios, as well as television sets and computers for 50 years, before being superseded by the transistor.
 

Image Ref.

10305543
 

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