3 o8 



TABLE 877. 



TRANSMISSION PERCENTAGES OF RADIATION THROUGH MOIST AIR. 



(For bodies at laboratory temperatures; for transmission of shorter -wave energy, see Table 553.) 



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 be- 

 tween the wave-lengths of the first column is multiplied by the corresponding transmission coefficients of the subse- 

 quent columns. The values for the wave-lengths greater than i8ju are tentative and doubtful. Fowle, Water-vapor 

 Transparency, Smithsonian Misc. Collections, 68, No. 8, 1917; Fowle, The Transparency of Aqueous Vapor, Astro- 

 physical J. 42, p. 394, 1915. 



In the above table italicized figures indicate extrapolated values. 



F. Paschen gives (Annalen d. Physik u. Chemie, 51, p. 14, 1894) the absorption of the radiation from a blackened 

 strip at 500 C by a layer 3.? centimeters thick of water vapor at 100 C and atmospheric pressure as follows: 



Wave-length ................. 



Percentage absorption ......... 



2 . 20-3 . 



80 



5-33-7-67M 

 94 



94-13 



The following table, due to Rubens and Aschkinass (Annalen d. Physik u. Chemie, 64, p. 598, 1898), gives the 



Wave-length 



Percentage absorption 



Wave-length I4-3M 



Percentage absorption 43 



SMITHSONIAN TABLES. 



35 



I5-7M 

 6S 



16.0/4 

 52 



80 



2O.O/J 

 IOO 



