. Spectroradiometric investigation of the transmission of various substances . the Bureau of Standards [ According to Gage,27 this glass absorbs the band ofcarbon, but transmits the band of the carbon arc. Crookess sage-green (A. O. C, Ferrous Xo. 30) is anotherinteresting glass, having a high absorption in the infra-red, curve C, Fig. 17 (/ = mm), and a band of high transmission (45per cent) at in the green. Combined with a water cell(or better still, cupric chloride solution), this glass enables one toobtain visible radiations free from infra-red rays. A blue-
. Spectroradiometric investigation of the transmission of various substances . the Bureau of Standards [ According to Gage,27 this glass absorbs the band ofcarbon, but transmits the band of the carbon arc. Crookess sage-green (A. O. C, Ferrous Xo. 30) is anotherinteresting glass, having a high absorption in the infra-red, curve C, Fig. 17 (/ = mm), and a band of high transmission (45per cent) at in the green. Combined with a water cell(or better still, cupric chloride solution), this glass enables one toobtain visible radiations free from infra-red rays. A blue-green glass (A. O. C, lab. No. 59, ^ = mm), whichtransmits about 40 per cent in the visible, is illustrated in curve D, Fig. 17. In the infra-red it is more opaque than the sage-. s.^ Fig. 18.—A, Lab. No. 61, A. 0. C; B and D, Fieuzal glass, shade B; C, Hallauer glass green glass just described, and exhibits some of the characteristicsof the bluish-green Corning glass, G 124JA, Curve C, Fig. 11. 11. COLORLESS GLASSES The transmission curve of a white crown glass is given in , curve E (/ = mm). It is of interest in comparison withyellow and amber-colored glasses which have a high absorptionin the violet, but which show little or no absorption in the infra-red, caused by the coloring matter. Pyrex glass, from the Corning Glass Works (colorless, mm), has a marked absorption band at , as is true of :; Gage, Trans. Ilium. Eng. Soc, 11 (2), p. 1050; 1916. Coblentz,Emerson, Long] Transmission of Various Substances 671 all glasses containing a high percentage of silica. (See curve C,Fig. 7.) Window glass contains iron, which causes a greenish is produced by an absorption band that has its maximum At. (See curves^ and C,
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