File:Selective radiation from various solids (1908) (14790043523).jpg

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Identifier: select515919119089797unse (find matches)
Title: Selective radiation from various solids
Year: 1908 (1900s)
Authors:
Subjects: rays and radiation light reflection spectra
Publisher: National Bureau of Standards
Contributing Library: NIST Research Library
Digitizing Sponsor: NIST Research Library

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ned to the terminals of the rod. The current w^asmeasured with a milliammeter of a suitable range to insure accuracy. II. RADIATION FROM ELECTRICALLY HEATED SOLIDS. Prominent among this group of substances are a series of sili-cates, which have an emission band in common at 2.9/Li, char-acteristic of SiOg, which is as sharp as any yet found in gases.The absorption spectra of many of these compounds are recordedin a previous paper by the author.^ In order to give the reader some idea of the conditions underwhich the data were obtained, a rough estimation is made of thetemperature at which a complete radiator would emit light of acolor similar to that given out by the substance under investigation.The length of the rods used depended upon the melting point.The ends of the rods were shielded from the spectrometer slit. ^ Carnegie Publication No. 65.—Investigations of Infra-Red Spectra, CarnegieInstitution of Washington, Dec, 1906. Coblentz.l Selective Radiation from Various Solids. 163
Text Appearing After Image:
3 4 5 6 WAVE LENGTH 164 Bulletin of the Bureait of Standards. (Voi.5,no.2. All the curves are reduced to the normal spectrum by dividingthe observed galvanometer deflections by the slit-width expressedin wave-lengths. The unsteadiness of the bolometer preventedan accurate mapping of small emission bands occurring beyond 6/-t. 1. Zirconiuin Oxide (ZrO^.—(Rod 10 x 2 x 1.4 mm. Energyconsumption, 3.5 (900°), 4.8, 5.6, 8.5 watts. Curves a, 6, c, d,Fig. i; and 9.6, 12, and 13.6 (1400°) watts. Curves a, 6, c,Fig. 2). The specimen examined was a fragment from a furnace.It probably contained some binder, although from the curvefor the pure material. Fig. 8, it appears that the foreign substancecontributed but little to the emission bands. The fine platinumterminals were wound around the ends of the rod, which was about10 mm long, the distance between the terminals being 5 mm.The curves are conspicuous for their sharp emission band at 4.3/U,which remains superposed upon the continuous backgselect515919119089797unse

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https://www.flickr.com/photos/internetarchivebookimages/14790043523/

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Volume
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1908
Flickr tags
InfoField
  • bookid:select515919119089797unse
  • bookyear:1908
  • bookdecade:1900
  • bookcentury:1900
  • booksubject:rays_and_radiation
  • booksubject:light_reflection
  • booksubject:spectra
  • bookpublisher:National_Bureau_of_Standards
  • bookcontributor:NIST_Research_Library
  • booksponsor:NIST_Research_Library
  • bookleafnumber:8
  • bookcollection:NBSBulletin
  • bookcollection:NISTresearchlibrary
  • bookcollection:fedlink
  • bookcollection:americana
Flickr posted date
InfoField
28 July 2014


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