4,6o Dr. Herschel's Experiments on the solar, and 





Sun. 



Coach glass ; both sides rubbed on emery. 



o' 



hi 



<fei 



5 



75l 



7ii-.. %\ if = ,265 



It stops J 35 scattered rays of heat, and 946 of light. 



54//) Experiment. 



I placed now the coach glass, one side of which had been 

 rubbed on emery, upon the transmitting hole, and over it the 

 crown glass prepared in the same manner, both with the 

 rough side towards the sun ; but two slips of card were placed 

 between the glasses, to keep them from touching each other. 



f Crown glass.") One side of each rubbed 

 \ Coach glass. J on emery. 



o' 67 67 



5 73f 69 . . . 6f : 2 = ,302 



These glasses stop 698 scattered rays of heat, and 969 of 

 light. 



55th Experiment, 



I placed now the coach glass, with both sides rubbed on 

 emery, on the transmitting hole, and over it the crown glass 

 prepared in the same manner, with two slips of card between 

 them, to prevent a contact. ' 



{Coach glass, i Both sides of each rubbed on 

 n 1 V 



Crown glass. J emery. 



°' 69% 6 9 jr 



5 75i 7°j • • • H ' H = > 200 



These glasses stop 800 scattered rays of heat, and gyg of 



light. 



56th Experiment. 



I used now all the four glasses; placing them as follows, 

 and putting slips of card between them, to prevent a contact. 



