547 



TABLE 569.— INFRARED TRANSMISSION, IN PERCENT, OF A NUMBER OF 



MATERIALS 188 



•" Data from E. K. Plyler, Nat. Bur. Standards Journ. Res., vol. 41, p. 125, 1948, and E. K. Plyler, National 

 Bureau of Standards, private communication. Cesium bromide data by E. K. Plyler and F. A. Phelps. 



TABLE 570.— INFRARED TRANSMISSION OF GASES (percent) 189 



188 Strong, Phys. Rev., vol. 37, p. 1565, 1931, Restrahlung. 



TABLE 571.— INFRARED TRANSMISSION OF SOLIDS (percent) 



Material Description 



Lacquer film ±.55/i thickness 



Mica 10/i thickness 



Soot on lacquer Opaque to visible 



Quartz, fused 10/i thickness 



Glass 3/i thickness 



Cellophane 25/i thickness 



MgO Deposit from burning 



Mg ribbon 



ZnO Deposit from Zn arc 



SMITHSONIAN PHYSICAL TABLES 



