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The original thermionic valve made by
Sir John Ambrose Fleming (1849-1945)
of University College London
for experiments
on an effect seen in early electric lamps.
Beginning in the 1880s he investigated the Edison
effect,
electrical conduction within a glass bulb from an
incandescent filament to a metal plate. In 1904 he
constructed such a bulb and used it to rectify high
frequency oscillations and
thus detect wireless signals. The same year Fleming
patented the device, later known as the 'Fleming
valve'. |
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zaterdag 03 december 2016
