File:Selective radiation from various solids (1908) (14583540228).jpg

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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de 0.8 to 1.5 mm thick, on Nernst heater tube fromwhich the clay covering had been removed. Fig. 8, curve a is forzirconia.) The zirconium oxide was the pure material and washeated to a dull red, being at a somewhat lower temperature thanthe rod heated electrically. The emission spectrum is conspicuousfor its two sharp emission bands at 2.83 and 4.3/^, respectively.Smaller maxima appear at 2, 2.4, and s.^/Ji. The magnesium oxide spectrum shows two wide bands, at 3 and5.3/>t, respectively, with a smaller band at 2.1 and a deep depressionat s.Sfi. 2. Cerium Oxide (Ce^ 0^).Thorium Oxide (Th 0^.Uranium Oxide (U^ O3). The Cerium oxide curve (c. Fig. 7) shows a strong emission at2 to 3/Lt, as was shown by Rubens, with possible bands at 4.4 and7.5/>t. It was shown by Rubens* that beyond 7.5/x the emissivityapproaches that of a complete radiator. For the Welsbach gasmantle which is composed of 99% Th 03+1% Cefi^ Rubens52839—08 2 172 Btillettn of the Bureau of Standards. IVoi. 5, m. 2.
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4 5 6 7 WAVE LENGTH Coblentz.) Selective Radiatio7t from Vainoiis Solids. ^n found the radiation curve to be flat and suppressed, similar tocurve h, Fig. 8. A rod i mm diameter, made of 99% Th Og-f i %CcgOg and heated white hot, electrically, gives an entirely dif-ferent spectrum from the gas mantle, curve d, Fig. 8. It is prob-able that this is due to the thickness of the radiating layer. The Thorium oxide curve (6, Fig. 8) shows no marked emissionbands, and the whole spectrum to y/^t is suppressed. Beyond this 28cm 26 24 22

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