8§6 
Report of the Committee 
On the freezing point. 
In adjufting the freezing as well as the boiling point, 
the quickfilver in the tube ought to be kept of the fame 
heat as that in the ball. In the generality of thermome- 
ters, indeed, the diftance of the freezing point from the 
ball is fo fmall, that the greateft error which can arife 
from neglecting this precaution is not very confiderable, 
unlefs the weather is warmer than ufual; but as the 
freezing point is frequently placed at a confiderable dif- 
tance from the ball, the operator fhould always be care- 
ful either to pile the pounded ice to fuch a height above 
the ball, that the error, which can arife from the quick- 
filver in the remaining part of the tube not being heated 
equally with that in the ball, fhall be very fmall; or he 
muft correft the obferved point, upon that account, ac- 
cording to the following table : 
Heat of the air. 
Correction. 
42 ° 
.00087 
5 2 
.00174 
62 
.00261 
72 
.00348 
82 
•0043s 
The 
