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Thermionic Valves First wireless detector to use a thermionic valve, 1904

Thermionic Valves First wireless detector to use a thermionic valve, 1904
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Largest available format 1954 × 3103 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 1954 × 3103 px 165 × 263 mm 509 KB
Medium 645 × 1024 px 55 × 87 mm 314 KB

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IMAGE number
UIS5081086
Image title
Thermionic Valves First wireless detector to use a thermionic valve, 1904
Auto-translated text View Original Source
Artist
Unknown
Location
Science Museum, London, UK
Medium
engraving
Image description

Thermionic Valves First wireless detector to use a thermionic valve, 1904. Part of the patent drawing of the first wireless detector to use a thermionic valve. The valve was made in 1889 by 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 Marconi's 1901 transatlantic transmissions. ©SSPL/Science Museum

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