in order to afcertain the height of Mountains . 577 
EXAMPLE I. 
Let the height of the barometer, obferved at the bot- 
tom of a mountain be 29.4 inches, the attached ther- 
mometer 50°, and the heat of the air 45 0 ; at the fame 
time that at the top of the mountain the barometer is 
found to hand at 25.190 inches, the attached thermo- 
meter at 46°, and the air-thermometer at 39°^; re- 
quired the height of the mountain in Englifh feet. 
Set the numbers down in the following order; 
4 F 
Vol. LXVII. 
Obfer- 
