in order to afcertain the height of Mountains. 563 
not here trouble the reader with the experiments at 
large, too Ample in themfelves to deferve fuch a detail, 
unlefs a future occation fhould render that neceffary, as 
the methods here ufed may be met with amongft 
hawkes bee’s or Mr. boyle’s experiments; and content 
mvfelf with relating only the refult of the different 
trials. 
1000 parts of air of the temperature of freezing and 
preffure of 30^ inches, increafed in volume by an add!- 
dition of 1 degree of heat on Fahrenheit’s thermo- 
meter as follows : 
Number of de- 
Expanfion for 
i° 
- 
Obfervations. 
grees the air was 
heated. 
in ioooths 
the whole. 
of 
^ I 
I4.6 
2.30 
2 
32.2 
2.43 
3 
40.3 
248 
With the firft ^ 
4 
46.6 
2.45 
Mean from the firft 
manometer. 
5 
49*7 
2.48 
* manometer 2.44. 
6 
51. 1 
2*51 
7 
2 3'7 
2.36 
. e 
2.24 
r 9 
22.0 
2.38 
\ 
With another 
10 
28.0 
2.SO 
1 Mean from the fecond 
manometer, < 
1 1 
2.34 
r manometer 2.42 
12 
30.1 
2.44 
1 
j 
‘ U , 
l I3 
22.6 
2.44 
4D2 
The 
