Flemings original thermionic valve, 1889.
UNITED KINGDOM - OCTOBER 22: Fleming's original thermionic valve, 1889. Made 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. Fleming later developed these valves as sensitive detectors of radio signals. (Photo by SSPL/Getty Images)
PURCHASE A LICENCE
How can I use this image?
£275.00
GBP
Getty ImagesFlemings original thermionic valve, 1889., News Photo
Flemings original thermionic valve, 1889. Get premium, high resolution news photos at Getty ImagesProduct #:90737398
Flemings original thermionic valve, 1889. Get premium, high resolution news photos at Getty ImagesProduct #:90737398£375£150
Getty Images
In stockPlease note: images depicting historical events may contain themes, or have descriptions, that do not reflect current understanding. They are provided in a historical context. Learn more.
DETAILS
Restrictions:
Contact your local office for all commercial or promotional uses.
Credit:
Editorial #:
90737398
Collection:
SSPL
Date created:
22 October, 1997
Upload date:
Licence type:
Release info:
Not released. More information
Source:
SSPL
Object name:
10307352
Max file size:
2637 x 3504 px (22.33 x 29.67 cm) - 300 dpi - 3 MB