Annual Report of the Board of Regents of the Smithsonian InstitutionThe Institution, 1921 |
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Сторінка 182
... airplane wireless tele- phone sets in the brief space of a few months involved many prob- lems of an extremely unusual and difficult nature . As an example may be cited the production of the vacuum tubes required for use in the sets ...
... airplane wireless tele- phone sets in the brief space of a few months involved many prob- lems of an extremely unusual and difficult nature . As an example may be cited the production of the vacuum tubes required for use in the sets ...
Сторінка 188
... airplane wireless telephone consisted of a wire trailing behind the airplane in flight and connected through the apparatus with the frame of the airplane as a counterpoise . The length of this wire was ordinarily 300 feet . A reel was ...
... airplane wireless telephone consisted of a wire trailing behind the airplane in flight and connected through the apparatus with the frame of the airplane as a counterpoise . The length of this wire was ordinarily 300 feet . A reel was ...
Сторінка 188
... airplane . The tactical uses of the airplane wireless telephone called for trans- mission and reception on certain airplanes and for reception only on other airplanes . The apparatus developed therefor included two distinct types , one ...
... airplane . The tactical uses of the airplane wireless telephone called for trans- mission and reception on certain airplanes and for reception only on other airplanes . The apparatus developed therefor included two distinct types , one ...
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Bureau of American Ethnology | 17 |
Report on the United States National Museum | 25 |
EXECUTIVE COMMITTEE AND REGENTS | 100 |
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