NO. 8 



WATER-VAPOR TRANSPARENCY — FOWLE 



45 



the atmosphere at sea-level taken as unity. Figure 15 gives means 

 to compute the losses due to absorption in the bands. The scattering 

 losses should be computed first, and then allowance made for the 



Tahle 9.— Washington. Atmospheric Absorption for Dry Air and Dry 



Air Plus Dust and Various Amounts of Water Vapor 



Altitude sea-level ; Barometer 76.0 cm. 



Incident solar radiation, 1.93 15° C.-gram-calories per sq. cm. per minute 



Air masses 



Prccipitable water vapor I A .... 



1 CO O 



0.00 cm. ! 



Air scattered 0.18 



Air absorbed 01 



Total lost 19 



0.5 cm. February 15 



UoO scattered 08 



H2O absorbed 12 



Total lost 39 



1 .8 cm. October 4 



H2O scattered 26 



H>0 absorbed 15 



Total 60 



2.4 cm.. May 14 



H:;0 scattered 38 



H2O absorbed .16 



Total 0.73 



u 



E CO 



ra o 



9.30.33 



0.5J .01 

 10. 0: .34 



U CI 



u O 



cd o 



C (A I u en 



no 1-0 



C !P-i 



E 05 



d o 



u o 



Pi 



4.II 



6.21 

 20. oi 



13.5 



7.8 



31.0 



.15 

 .13 

 .62 



.42 

 .16 

 .92 



17.10.4422.80.53 



0.5 .01' 0.5 .01 



18.0 .4523.0 .54 



7.8 



6.7 



32.0 



.21 10.9 .26 



•14^ 7.3 .14 

 .8042.0 .94 



19-7 .56 



8.3| .16 



38.o'i.o6 



21. 8i .53|27.5, -61 



8.3J .16 8.3 .14 



48. oil. 14159. 0,1 .29 



i ; 

 29. o| .67134.7 .74 

 8.3I .i5| 7.8: .14 

 55.011.2766.0 1 .42 



27.50.6131, 



0.5 .01 o. 



28.0 .6232. 



1 



13.5 .3015. 

 7.3. .14I 7- 



49.01.0655. 



31.6 .6734. 

 7.3 .13' 6. 



67.01.4274. 



38.31 .7840. 



7-3] .13I 6. 



74.01.5379. 



■6o.73j37.8 

 5 -Oij 0.5 

 .0 .74138.0 



■ 5 .37ii9.2 

 3' .141 7-3 

 ,01.2565.0 



7 .74138.3 

 7 .11 5.7 

 01.5982.0 



43.0 



5-2 



01 .6786.0 



Table 10. — 60° Ultra- Violet Glass Prismatic Solar Energy-Curve: 



Also Dry Air and z\guEOus Vapor (i cm. Precipitable 



Water) Transmission Coefficients 



X . .. 



Co\ ■ 



an\ , 



\ . .. 



Co\ . 

 aa\ ■ 



X . .. 



aa\ . 



0.342 0.350 



102 130 



<o. 595) 1^0.626) 



o . 920 o . 926 



0.503 



907 



0.885 



0.968 



1-452 



586 



0.998 



0.535 



1044 



0.898 



0.972 



1.603 

 435 

 0.999 



o . 987 o . 987 



0.360, 0.371 



i60| 198! 



0.655 0.6861 



0.934 0.940 



0.574 0.6241 



1 197 1334 

 0.905! 0.929! 

 o.97or 0.975 



1.738! 1. 8701 



343 262! 



0.999 0.999 



0.987 0.9871 



o.452i 0.475 



681 807 



0.840 0.863 



0.961I 0.964 



1. 146 1.302 



1025 775 



0.996 0.997 



0.987 0.987 



Ijand absorption losses by means of figure 14, remembering that the 

 losses there given pertain to the energy over a range of wave-lengths 

 indicated by the corresponding lines at the bottom of figure 14. 



