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for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and
Switzerland. The creator and year of publication are essential information and must be provided. See
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Photograph of the oscillation valves first employed by Dr. J. A. Fleming, FRS, in
October 1904, for the rectification of high-frequency electric oscillations as used in wireless telegraphy.
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Photograph of the oscillation valves first employed by Dr. J. A. Fleming, FRS, in
October 1904, for the rectification of high-frequency electric oscillations as used in wireless telegraphy
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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date QS:P,+1950-00-00T00:00:00Z/7,P1319,+1904-00-00T00:00:00Z/9,P1326,+1919-00-00T00:00:00Z/9
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occurred prior to
January 1, 1929, and if not then due to lack of notice or renewal. See
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The
Thermionic Valve and its Developments in Radiotelegraphy and Telephony
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Click on a date/time to view the file as it appeared at that time.
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heated white-hot by a current through it, and a metal
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Commons is a freely licensed media file repository.
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193:usually consisting of a flat
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582:Електровакуумний діод
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552:لامپ فلمینگ
474:Vacuum tube
296:publication
175:vacuum tube
141:Description
492:صمام فلمنغ
460:File usage
417:Dimensions
179:electrodes
85:image/jpeg
27:File usage
449:Chetvorno
414:Thumbnail
411:Date/Time
300:this page
245:Licensing
150:English:
590:Metadata
547:لامپ خلأ
443:(621 KB)
362:Captions
187:filament
163:detector
37:Metadata
428:current
423:Comment
386:depicts
366:English
290:in the
183:cathode
161:, as a
133:Summary
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191:anode
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
