ca 
["293"" ] 
Tus temperature of the mercury at the beginning of obfervation 
was 113,5- 
Without ftopper. 
Increments of , 
Minutes of obfervation. ; Temperatures, ; . Temperature in a minute. 
I E x 135 4 21,5 
2 - ~ Tog = = hga,g 
3 a ‘ a x 1955 
4 - i at 196 - - 19 
5) eh 5 213 2 17—99,5 in 5°. 
The-enlarged ftopper was now put in. 
6 " ahaa ; 34 
7 - - 329. == - 82 
8 4 =, FEEAS e 735 
ie D sia q ‘Asiihghik Shel alana aia se= LP) 
4 10 - ys - 56—311in 5° 
As the proportion of 311 to 99,5 is much greater than of 244 
to 142,5, the enlarged ftopper appeared to have confiderable ad- 
vantage in encreafing the heat. 
The comparative effet of the two ftoppers was determined 
Bf by another trial, as is expreffed in the following tables. 
! ; Lamp with enlarged ftopper. 
Temperature of mercury 125. 
Increments of 
Minutes of obferyation. ‘Temperatures. _ Temperature in a minute. 
7 a 175 ‘ 5° 
= - 228 - - 53 
. =. Bah - 46 
