Tables 186-188. I93 



TRANSMISSIBILITY FOR RADIATION OF JENA GLASSES. 



TABLE 186. 



Coefficients, a, in the formula It = I^a*, where /q is the Intensity before, and It after, transmission 

 through the thickness t, expressed in centimetres. Deduced from observations by Miiller, 

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



TABLE 187. 



Note: With the following data, t must be expressed in millimetres; i. e. the figures as given 

 give the transmissions for thickness of i mm. 



This and the following table are taken from Jenaer Glas fiir die Optik, Liste 751, 1909 



TABLE 188. — Transmlssiblllty of Jena Ultra-violet Glasses. 



Smithsonian Tables. 



