meafuring Heights with the Barometer. 703 
table hi. Refults of experiments on the expanlion of 
air of the denfity of the common atmofphere. 
N c 
3 
Firft fet; common 
air. " 4 
5 
6 
7 
: econd fet; common <j ^ 
air heated red-hot 1 9 
height 
of the 
barom. 
Inches of 
quickfilver 
confining the 
air. 
Denfity 
in 
inches. 
Total cxpanfion 
of 1000 equal 
parts of air by 
ziz°. 
Mean rate 
for each 
degree* 
29.95 
+ *•57 
31-52 
483.89 
2.28250 
30.07 
+ 0.70 
3°*77 
482.IO 
2.27406 
29.48 
•+0.42 
29.90 
480.74 
2.26764 
29.90 
+ 0.83 
3 Q *73 
485.86 
2.29182 
29.96 
+ 0.96 
30.92 
4894s 
2.30870 
29.90 
+ 0.65 
3°-55 
476.04 
2.24547 
29.95 
+ 0.65 
30.60 
487-55 
2.29976 
3007 
+ °-53 
30.60 
482 80 
2.27736 
29 48 
+ 0 52 
30.00 
489.47 
2.30871 
Mean 
30.62 
484.21 
2.28401 
The total expanlion 484.21 being divided into parts 
proportionable to the manometrical fpaces, meafured in 
degrees of the quickfilver thermometer, as already given ; 
we have the following expanlions for intermediate tem- 
peratures, the rates for every 1 o° below 92 0 being found 
by interpolation. 
4X2 
Ther- 
