meafuring Heights with the Barometer. 6 8 r 
quickfilver in the barometer, affected by the 3 2° of cold 
below freezing, is .1099: and that the expanfion from 
20° of heat, between 32 0 and 52 0 , is .0663, a number 
agreeing perfectly well with former refults. If the con- 
denfation .1099 thus found, be added to the expanfion 
• 5117 arifing from the fecond clafs of experiments, we 
fhall have .6216 for the total difference of height of the 
columns of quickfilver in two barometers, fulfaining the 
fame preffure, but differing from each other in their tem- 
peratures ai2° of Fahrenheit’s thermometer. 
The feries of numbers exprefled in the annexed table, 
agreeing in all effential refpects with the expanfions 
found by experiment, will therefore fhew that which 
correfponds to any intermediate temperature, for every 
I o° of the fcale. 
4 T 
Vol. LXVII. 
Rate 
