086 Tables 438 and 439 



TABLE 438.— Transmissibility of Radiation by Jena Glasses 



Coefficients, a, in the formula It = ha 1 , where 7 is the Intensity before, and It after, 

 transmission through the thickness /. Deduced from observations by Muller, Vogel, and 

 Rubens as quoted in Hovestadt's Jena Glass (English translation). 



TABLE 439. — Transmissibility of Radiation by Jena Colored Glasses 



Taken from Catalog 4213, 1931 , Schott and Gen, (41 glasses). R is reflection factor yellow- 

 light for two surfaces. Values of transmission are for 1 mm thickness. Ordinary figures 

 refer to wave lengths in n, .281 to .775, black-faced to infra-red. 



Smithsonian Tables 



