Transmission of Infra-red, Rays and of Radiant Energy. 69 



Table VI. — Calculated Values of Heat absorbed by Cornea, Lens, and Iris. 



Wave-length in 

 A.U. 



I. 



Percentage of 

 heat energy 

 absorbed by 



cornea of that 

 incident on 

 cornea. 



n. 



Percentage of 

 heat energy 

 absorbed by iris 

 of that incident 

 in cornea. 



m. 



Percentage of Percentage of 

 heat energy heat energy 



transmitted by absorbed by lens 

 lens of that of that incident 



incident on lens. on cornea. 



7.000 



— 



95 



100 





7,500 



— 



95 



99 -4 



0-4 



8.000 



— 



94 -5 



99 1 



0-9 



8,500 



— 



94 -2 



98 -8 



1 2 



9,000 



0-3 



93 -6 



98 -2 



1 -7 



9,500 



3 1 



85 -4 



89 3 



9-2 



9,750 



3-9 



83 -1 



87 -1 



10 -6 



10,000 



3 



85 -8 



90 -0 



8-6 



10,500 



0-9 



92 



96 -7 



03 



11,000 



1-6 



90 



94 -6 



4 9 



11.500 



8-1 



71 -5 



74 3 



18-3 



12,000 



11 1 



63 7 



66 2 



21 -5 



12,500 



10 -5 



65 "7 



68 - 4 



20 -8 



12,750 



10 -2 



65 6 



68 -3 



20 8 



13,000 



12-1 



61 



63 -1 



24 



13,500 



22 -5 



36 4 



36 -9 



23 



14,000 



74 



72 



0-63 



72 



14,500 



92 



— 







15,000 



84 -6 



1 -1 



0-08 



1 1 



15,500 



69 5 



1 -37 



1 -23 



1 37 



16,000 



49 -3 



8-7 



8-4 



8 



16,500 



44 '2 



12 "2 



11-8 



10 -8 



17'000 



47 -2 



10 



9 53 



9 



17.500 



55 "2 



5 6 



5 37 



5 3 



18,000 



77 "4 



0-42 



36 



0-42 



18,500 



92 5 









19.000 



95 5 









19,500 



95 









20,000 



93 









This Table is shown plotted in tig. 7. 



■0,000 15.000 20.000 



Fig. 7. 



