. Spectroradiometric investigation of the transmission of various substances . ous for its absorption band at , which is found inordinary glass containing iron as an impurity. (See curve A,Fig. 20.) This property makes it useful as an absorption glass in 15 Gage, Trans. Ilium. Eng. Soc, 11 (2), p. 1050; 1916. 16 Luckiesh, Trans. Ilium. Eng. Soc, 9, p. 472, 1914; Gage, Trans. Ilium. Eng. 11 (2), p. 1050,1916. 17 This Bureaus Technologic Paper No. 93, 1917. 18 Kindly supplied by the Corning Glass Works, Corning, N. Y. 66o Bulletin oj the Bureau oj Stajudards [Vol. 14 the eyepiece of a
. Spectroradiometric investigation of the transmission of various substances . ous for its absorption band at , which is found inordinary glass containing iron as an impurity. (See curve A,Fig. 20.) This property makes it useful as an absorption glass in 15 Gage, Trans. Ilium. Eng. Soc, 11 (2), p. 1050; 1916. 16 Luckiesh, Trans. Ilium. Eng. Soc, 9, p. 472, 1914; Gage, Trans. Ilium. Eng. 11 (2), p. 1050,1916. 17 This Bureaus Technologic Paper No. 93, 1917. 18 Kindly supplied by the Corning Glass Works, Corning, N. Y. 66o Bulletin oj the Bureau oj Stajudards [Vol. 14 the eyepiece of an optical pyrometer. Combined with the lightblue-green glass, Corning G 124JA (Fig. 11, C), to limit moreeffectively the deep red end of the spectrum, a narrower mono-chromatic red line is produced. This combination has been founduseful and well adapted for optical pyrometer measurements. Curve B, Fig. 6, gives the transmission of a sample of Schottsred glass, Xo. 2745 (t = $.i8 mm), which is conspicuous for itsextraordinary transparency of 85 to 90 per cent, extending from. SO Fig. 6.—Transmission oj red glasses ; i to Using a 1 cm cell of water and a red glass, a strongtransmission band is obtained at about in. 2. ORANGE GLASSES The samples examined were Corning G 34 and G 36 (^ = and mm, respectively), curves B and A, Fig. 7. Theyhave the characteristic absorption band of the selenium red glass,Fig. 6, but probably contain a substance which increases the trans-parency at 3 to 4/i. In the visible, the transmission terminatesrather abruptly at about Chemically, these glasses belongto the group of selenium red and noviol yellow glasses. Coblentz,Emerson, Long. ] Transmission of Various Substances 3. YELLOW GLASSES 661 In Fig. 8, curves A and B, give the transmission of two fluor-escent yellow, glasses, Corning G 371 0 = mm) and G 311 Y(2 = mm). The coloring matter is presumably uranium,which produces the absorption bands at 0
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