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Thermionic Valves Fleming's original thermionic valve, 1889

Thermionic Valves Fleming's original thermionic valve, 1889
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IMAGE number
UIS5079659
Image title
Thermionic Valves Fleming's original thermionic valve, 1889
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

Thermionic Valves Fleming's original thermionic valve, 1889. The original thermionic valve made by Sir John Ambrose Fleming (1849-1945) for experiments on an effect seen in early electric lamps. The source of current is a heated negative electrode, the cathode. Current flows through the vacuum to the positive electrode, the anode. In 1899 Fleming became a technical adviser to the Marconi Company, helping design the Poldhu transmitter in Cornwall, used in Guglielmo Marconi's (1874-1937) 1901 transatlantic transmissions. Fleming later developed these valves as sensitive detectors of radio signals. ©SSPL/Science Museum

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