ОписаниеCooking with radio waves - Chicago Worlds Fair 1933.jpg
English: Demonstration of cooking by radio waves at the 1933 Chicago World's Fair, "Century of Progress", Chicago, Illinois, USA from 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 wavetransmitter, 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)
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.
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Public domainPublic domainfalsefalse
Это произведение находится в общественном достоянии, поскольку оно было опубликовано в США между 1929 и 1963 годами и авторское право на него не было возобновлено, вне зависимости от того, присутствовало ли изначально или нет уведомление об авторских правах. Если автор не умер определённое количество лет назад, то это произведение защищено авторским правом в странах и на территориях, не применяющих правило более короткого срока для произведений из США, например, в Канаде (70 p.m.a.), Континентальном Китае (50 p.m.a., не в Гонконге и Макао), Германии (70 p.m.a.), Мексике (100 p.m.a.), Швейцарии (70 p.m.a.), а также других странах в соответствии с индивидуальными соглашениями. См. дополнительные пояснения на странице Commons:Hirtle chart.
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Actress Fifi D'Orsay assists engineer G. R. Severance in a demonstration of his new method of "cooking by short waves" at the 1933 Chicago World's Fair