﻿ABSORPTION OF WATER \ >lPOR 



tained from the upper line of a pair, a., that corresponding to the 



lower, and a the coefficient for the water vapor alone, then 



log a = (log J j -r- « 



An.l in the second place, referring to plates iy and v 



lo" - / 



loo' tf = 



WO 



(5) 



(6) 



The values of these transmission coefficients for the various water 

 vapor hands are exhibited in the following table: 



Table IV 



The fifth and sixth columns are continuations of the last two 

 columns of Table in. Column five indicates the amount of radiation 

 transmitted in the band at an air mass of two atmospheres, expressed 

 as a fraction of the amount which would be found if there were no 

 water vapor absorption. Extrapolating to zero both from the hand 

 and from the smoothed curve over the band, as in plates n and in, 

 it mav be found how nearly the band is obliterated outside the atmos- 



