. Glasses for protecting eyes from injurious 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
. Glasses for protecting eyes from injurious 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. ,* Fig. 6 Corning New Noviweld glasses: Top curve=shade 30 per cent; second curve from top=shade 3; nextlower curve=shade 4K; bottom curve=shades 6 and 7. Thickness of glasses, ynyn which is given in Fig. 4. The makers number of this new noviweldglass is 391 DM (blowing-room designation 39 J). As illustrated in Fig. 6, the infra-red transmission of the modern
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