Irving_Langmuir_and_Guglielmo_Marconi_in_lab.jpg
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Summary
Description Irving Langmuir and Guglielmo Marconi in lab.jpg |
English:
Physicist
Irving Langmuir
(center)
in his lab at
General Electric
in 1922, showing radio pioneer
Guglielmo Marconi
(right)
a new 20 kW
triode
vacuum tube
GE has developed for
radio transmitters
. Langmuir, a pioneer in vacuum technology and the inventor of the
diffusion pump
, is responsible for developing the modern "hard vacuum" radio tubes. The man on the left is Willis R. Whitney, director of GE's research lab.
|
Date | |
Source | Downloaded 28 August 2013 from "New 20 Kw Vacuum Tubes Open Great Radio Transmission Possibilities", Electrical Record (Electrical Record Publishing Co., New York), Vol. 32, No. 2, August 1922, p. 73 on Google Books |
Author | Unknown author Unknown author |
Licensing
Public domain Public domain false false |
This media file is in the
public domain
in the
United States
. This applies to U.S. works where the copyright has expired, often because its first
publication
occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See
this page
for further explanation.
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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
rule of the shorter term
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
Wikipedia:Public domain
and
Wikipedia:Copyrights
for more details.
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