. Spectroradiometric investigation of the transmission of various substances . 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
. Spectroradiometric investigation of the transmission of various substances . 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 and Corning noviol (shade B, 2 = mm), curve C, Fig. 8, (alsoFig. 19) is a light-colored, yellow glass used for protecting the eyesfrom ultra-violet light. This glass is opaque 19 to ultra-violet. S^u. Fig. 7.—Transmission of Corning orange-colored glasses: A, G 36; B, G 34; C, CorningPyrex glass (1= mm) radiations (as indicated by the dotted line in Fig. 8, which rep-resents data taken from Gages paper). An examination of vari-ous shades of this glass shows that the coloring matter does nothave a marked effect upon the infra-red 11 Noviweld is a dark-yellow, eye-protective glass which absorbsthe blue and violet, and transmits red, yellow, and green. Thesamples examined were kindly provided for examination by Dr. 19 Gage, Trans. Ilium. Eng. Soc, 11 (2), p. 1050; 1916. M This Bureaus Technologic Paper No. 93; 1917. In this paper, Fig. 1, curve B, is novial Shade Aand curve C, is noviol shade C. 110990°—19- -12 662 Bulletin of the Bureau of Standards [Vol. :4 H. P. Gage, of the Corning Glass Works. The makers number isCorning G 391 DM. The transmissions of various shades of thi
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