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



188th Experiment. 



Stove. Crown glass ; one side rubbed on emery. 



°' 49i 49i 



3 54i 5°j> • • • 5 •• i£ = ,225 



This glass, so prepared, stops 775 invisible rays of scattered 

 heat. 



189^ Experiment. 



Stove. Coach glass ; one side rubbed on emery, 



o' 50 50 



3 57\ 5i|-.--7i:i1r = > 2 59 



It stops 741 invisible rays of scattered heat. 



igotb Experiment. 



Stove. Crown glass ; both sides rubbed on emery. 



o' 52 52 



3 58 53... 6: 1 = ,167 



It stops 833 invisible rays of scattered heat. 



191^ Experiment. 



Stove. Coach glass ; both sides rubbed on emery. 



o' 52 52 



3 55t 5 2 |. • • 3i : i =,231" 



It stops 769 invisible rays of scattered heat. 



192^ Experiment. 



Stove. Olive colour, burnt in glass. 



3 57 53i • • • Si : 2 = ,3^4 



It stops 636 invisible rays of scattered heat. 



