Cooking_with_radio_waves_-_Short_Wave_Craft_Nov_1933_cover.jpg
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Summary
Description Cooking with radio waves - Short Wave Craft Nov 1933 cover.jpg |
English:
Demonstration of cooking by
radio waves
at the
1933 Chicago World's Fair, "Century of Progress"
, Chicago, Illinois, USA, illustration on cover of Hugo Gernsback radio magazine. This was a forerunner of modern
microwave ovens
which were developed in the 1950s. At Westinghouse Corp's "Powercasting" exhibit of futuristic shortwave technology, sandwiches were cooked by placing them between metal plates of a powerful 10 kW 60 MHz
short wave
transmitter
, as shown. The magazine article (p. 394) says steaks, potatoes, and vegetables were also cooked in a few minutes. The exhibit also demonstrated
wireless power transmission
; a 1/4 horsepower motor was run by radio waves over a distance of 30 feet, and audience members could expose their bodies to the radio waves and feel the heat generated. The short wave technology was developed at Westinghouse research laboratories by I. F. Mouromtseff, and the demonstrations were conducted by G. R. Severance and film star
Fifi D'Orsay
(shown)
|
Date | |
Source | Retrieved March 21, 2015 from Short Wave Craft magazine, Popular Book Corp., New York, Vol. 4, No. 7, November 1933, cover on http://www.americanradiohistory.com |
Author | Unknown author Unknown author |
Permission
( Reusing this file ) |
This 1933 issue of Short Wave Craft magazine would have the copyright renewed in 1961. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here . Search of the Renewals for Periodicals for 1960, 1961, and 1962 show no renewal entries for Short Wave Craft . Therefore the copyright was not renewed and it is in the public domain. |
Licensing
Public domain Public domain false false |
This work is in the
public domain
because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the
copyright was not renewed
. For further explanation, see
Commons:Hirtle chart
and
the copyright renewal logs
. Note that it may still be copyrighted in jurisdictions that do not apply the
rule of the shorter term
for US works (depending on the date of the author's death), such as Canada (70 years
p.m.a.
), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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