482 Dr. Herschel's Experiments on the solar, and 



131st Experiment. 



Fire. Dark-blue glass, 



o' 67 67 



5 84£ 73 ... 17$ : 6 . cor. — i' ;= ,296 



It stops 704 rays of fire-heat. 



132a? Experiment. 



Fire. Indigo glass. 



o' 69? 6 9t 



5 85f 73 a... 1 6|: 4 x == , 2 7 9 



It stops 721 rays of fire- heat. 



133^ Experiment. 



Fire. Pale indigo glass. 



o' 6 7 i 6 7 l 



5 §5f 74 • 1 • i8f : 6| . cor. — Jf = ,345 



It stops 655 rays of fire-heat. 



134^6 Experiment. 



Fire. Purple glass. 



O' % 69 



5 83 73f 14:4^ = ,321 



It stops 679 rays of fire- heat. 



135^ Experiment. 



Fire. Violet glass. 



o' 66± 66± 



5 86i 74i . . . 20 : 7f =± ,385 



It stops 615 rays of fire-heat, 



