392 Tables 449-451 



TABLE 449. — Transmission Percentages of Eadiation Through Moist Air 



The values of this table will be of use for finding the transmission of energy through air containing a 

 known amount of water vapor. An approximate value for the transmission may be had if the amount 

 of energy from the source between the wave lengths of the first column is multiplied by the correspond- 

 ing transmission coefficients of the subsequent columns. The values for the wave lengths greater than 

 i8/i are tentative and doubtful. Fowle, Water-vapor Transparency, Smithsonian Misc. Coll., 68, No. 8, 

 1917; Fowle, The Transparency of Aqueous Vapor, Astrophys. Journ. 42, 394, 1915. 



TABLE 450. — Transparency of Water Vapor (steam) 



(Hettner, Ann. Phys., 55, 476, 1918, places of greater absorption. Original article gives plot of absorption 



throughout range of wave lengths.) 



TABLE 451. — Transparency of Water 



Values of a in I = Ioe ad , d in cm Io, I, intensity before and after transmission. 



First 9; Kreusler, Drud. Ann. 6, 1901; next Ewan, Proc. R. Soc. 57, 1894, Aschkinass, Wied Ann. 



55, 1895; last 3, Nichols, Phys. Rev. 1, 1. 

 See Rubens, Ladenburg, Verh. D. Phys. Ges., p. 19, 1909, for extinction coefs, reflective power and 



index of refraction, 1 /it to 18 /i. 



Smithsonian Tables 



