File:Annual report of the Board of Regents of the Smithsonian Institution (1919) (14781016522).jpg

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Identifier: annualreportofbo1919smithso (find matches)
Title: Annual report of the Board of Regents of the Smithsonian Institution
Year: 1846 (1840s)
Authors: Smithsonian Institution. Board of Regents United States National Museum. Report of the U.S. National Museum Smithsonian Institution. Report of the Secretary
Subjects: Smithsonian Institution Smithsonian Institution. Archives Discoveries in science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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likewise shown schematicallyin figure 3. Eeference to this figure will indicate that the circuitcomprises a single resonant circuit, a vacuum tube detector, twovacuum tubes used as amplifiers, and a special helmet containingthe receivers. The detector and amplifier are not particularly novelin any respect, but the helmet containing the receivers is of veryunusual construction. The same noise conditions which were men-tioned above for the telephone transmitter likewise affected the recep-tion of signals in the telephone receivers. It was accordingly neces-sary to develop a special sound-insulating helmet in which the tele-phone receivers were mounted in such a way as to exclude almostcompletely from the aviators ears all sounds except those emanating WIRELESS TELEPHONY—SLAUGHTER. 187 from the telephone receivers. The design of a helmet which wouldaccomplish this and at the same time not prove to be uncomfortablerepresents one of the most striking accomplishments in the complete set.
Text Appearing After Image:
>*- The adjustment of the receiving set is of the utmost simplicity,there being only a variable capacity and inductance to adjust for the 188 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1919. particular wave length of the received signal. As in the case of thetransmitting set, these adjustments are ordinarily made before theplane leaves the ground, and it is usually necessary for the aviator tomake in flight only an extremely small adjustment in the capacity toinsure the proper tuning of the receiving set. Because of the con-dition of vibration existing on the airplane and the effect of thisvibration on the vacuum tubes used in the receiving apparatus, itwas necessary to devise a mechanical filter which would protect thevacuum tubes from these vibrations. The method finally adoptedconsisted of the use of sponge rubber supports for certain elementswithin the set box itself. The current required by the plate circuits of the receiving tubesand the negative grid potential for the modulator

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1919
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30 July 2014
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23 September 2015

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Date/TimeThumbnailDimensionsUserComment
current21:11, 29 September 2022Thumbnail for version as of 21:11, 29 September 20222,592 × 1,574 (1,012 KB)SteinsplitterBot (talk | contribs)Bot: Image rotated by 90°
13:46, 23 September 2015Thumbnail for version as of 13:46, 23 September 20151,574 × 2,592 (1,005 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': annualreportofbo1919smithso ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fannualreportofbo1919smit...

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