494 ® r - Serschel's Experiments on the solar, and 



178th Experiment. 



Stove. Yellow glass. 



o' 57i 57i 



3 6l z 59f---4 : H = »53i 



It stops 469 invisible rays of heat. 



179th Experiment. 







Stove. 



Pale-green glass. 











0' 



51 1 



51* 













3 



5^i 



53i • • ■ 



4f: 



H 



= 



,3^8 



It 



stops 632 



0' 



invisible rays 



Stove. 

 50 



of heat. 

 Experiment. 



Dark-green glass 



49i 













3 



53t 



5°i • • ■ 



.3i = 



'H 



= 



,300 



It stops 700 invisible rays of heat. 



181st Experiment. 



Stove. Bluish-green glass. 



3 55i 53 . . . 4f : 2 = ,444 



It stops 556 invisible rays of heat. 



182a 7 Experiment. 



Stove. Pale-blue glass. 



531 53i 



57f 55% • • ■ Si : H = '452 



It stops 548 invisible rays of heat. 



