Table 103. 

 TRANSMISSION PERCENTAGES OF RADIATION THROUGH MOIST AIR. 



F. Paschen gives {Annalcn d. Physik. u. Chemie, 51, p. 14, 1894) the absorption of the radiation 

 from a blackened strip at 500 C. by a layer 2,2, centimeters thick of water vapor at ioo° C. and 

 atmospheric pressure as follows: 



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

 1898), gives the absorption of radiation from a zircon burner by a layer 75 centimeters thick of 

 water vapor saturated at ioo° C. This amount of vapor is about equivalent to a layer of water 

 0.45 millimeter thick or to 1.5% of the water in a total vertical atmospheric column whose dew- 

 point at sea-level is 10° C. The region of spectrum examined includes most of the region of terres- 

 trial radiation. 



Smithsonian Tables. 



23I 



