Glasses for protecting eyes from injurious radiations[3rd ed.] . Called Pfunds patent gold glass; from the American Optical Co., Southbridge, Mass. 11 The samples examined were kindly supplied by the Corning Glass Works, Corning, N. Y. Ordinarygreen glass has a higher transmission in the infra-red than the samples herein described. (See PublicationNo. 97, p. 56, Carnegie Institution of Washington, 1908.) to technologic Papers of the Bureau of Standards mission ( per cent) as Crookess sage-green glass (C, Fig. 2) justdescribed. The color of objects is practically unchanged, so thatthe choice
Glasses for protecting eyes from injurious radiations[3rd ed.] . Called Pfunds patent gold glass; from the American Optical Co., Southbridge, Mass. 11 The samples examined were kindly supplied by the Corning Glass Works, Corning, N. Y. Ordinarygreen glass has a higher transmission in the infra-red than the samples herein described. (See PublicationNo. 97, p. 56, Carnegie Institution of Washington, 1908.) to technologic Papers of the Bureau of Standards mission ( per cent) as Crookess sage-green glass (C, Fig. 2) justdescribed. The color of objects is practically unchanged, so thatthe choice between these two glasses is a matter of individual transmission of the bluish-green Corning G 124 JA glass issomewhat higher than Crookess ferrous sage-green glass at *and at 4/*, and the maximum transmission is shifted further towardthe blue (from to ). (See further data in Fig. 7.) GREENISH-BROWN GLASSES Another type of colored glass for protecting the eye from theultra-violet and to some extent from the infra-red rays is a set of. (^u. A, C, gold glass: B, emission of black body (10500 C); D, electric smoke (red) [ordinates= emission scale] (t= mm) brownish, greenish-yellow to brownish-yellow colored (Novi-weld) glasses of variable transmission in the visible A, Fig. 4, gives the transmission of Corning G 124 HI, (shade3; thickness, mm). The maximum transmission in the visi-ble is about 27 per cent. The coloring matter is quite effectivein its absorption at in, but beyond 3/* the transmission is as highas in uncolored glass. Curve B, Fig. 4, gives the transmission of Corning G 5 CAD(shade 6; thickness, mm). The maximum transmission isabout 5 per cent in the visible, and the infra-red absorption is more Glasses for Protecting the Eyes ii effective than obtains in curve A. Neither of these types of glassesare as effective as the blue-green glass G 124 J, thickness, mm(C, Fig. 4) for obstructing the infra-red, alth
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Keywords: ., bookauthorcoblentz, bookcentury1900, bookdecade1910, bookyear1919
