. Glasses for protecting eyes from injurious iform and it amounts toabout per cent. In the infra-red the transmission is as lowas the colored glasses just described. In fact, the sample illus-trated in Fig. 2 transmitted but little beyond 3/u, although a lighter :s Coblentz, Publication No. 97, Carnegie Institution of Washington, 1908. 12 Technologic Papers of the Bureau of Standards colored sample was quite transparent to 5/x. This sample trans-mits about 18 per cent of the infra-red radiation emitted by a blackbody heated to 10500, and for many purposes this kind of blackgla
. Glasses for protecting eyes from injurious iform and it amounts toabout per cent. In the infra-red the transmission is as lowas the colored glasses just described. In fact, the sample illus-trated in Fig. 2 transmitted but little beyond 3/u, although a lighter :s Coblentz, Publication No. 97, Carnegie Institution of Washington, 1908. 12 Technologic Papers of the Bureau of Standards colored sample was quite transparent to 5/x. This sample trans-mits about 18 per cent of the infra-red radiation emitted by a blackbody heated to 10500, and for many purposes this kind of blackglass would be as effective as more expensive glasses for shieldingthe eyes from infra-red rays. (See Table 2, which gives the trans-mission of several smoke glasses from Bausch & I^omb. ShadeC is slightly darker than the shade B of Crookess neutral tintjust described.) C, Fig. 5, shows the transmission curve of a very dark spectacleglass (of unknown composition; thickness, mm), which hasbeen in use in this laboratory for a number of years. In the. SO^U- Corning glass: A, orange G 36 (t= mm); B, blue-green G 401 Z (1= mm). C, common black glass (t= mm) visible spectrum the transmission is about per cent. In theinfra-red the transmission is somewhat higher than Schotts blackglass just described. However, on the average it obstructs theinfra-red rays almost as effectively as some of the newer glassesjust described. NOVIWELD GLASSES Through the courtesy of Dr. H. P. Gage, of the Corning GlassWorks, who provided us with an assortment of colored glasses,the writers are able to include in this (revised) paper the trans-mission curves of a series of new glasses (known under the trade Glasses for Protecting the Eyes 13 name Noviweld Glasses) which are very opaque to infra-red,as well as visible and ultra-violet rays. The forerunner of theseglasses is G 5 CAD (see also G 124 HI,, etc.) the transmission of
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