fome Experiments made with an Air-pump , 63 3 
about 57 0 by a thermometer of Fahrenheit’s fcale : but 
the following experiments will fhew how much fome 
different degrees of heat affeil the degree of exhauftion. 
Height 
of the 
Therm. 
Degrees of exhauf- 
tion according to 
Barom. 
gage. 
Pear- 
gage. 
exp xxxix. Receiver fet on leather, which had 1 
lain all night in water, — J 
exp. xl. Receiver fet on a leather foaked alU 
night in two parts water and one of fpirit of > 
wine, — — — ■ J 
46 
46 
84 
76 
20,000 
8000 
The pump having been put in a room of the heat of 
57° of Fahrenheit’s fcale for feven hours together, 
with the leathers put in the fame water and the fame 
fpirit of wine and water which they had been foaked in 
all night, and which had been ufed in the two laft expe- 
riments, the following experiments were made. 
Height 
of the 
Therm. 
Degree of exhau£* 
tion according to 
( 
Barom. 
Pear- 
gage- 
gage. 
exp. xli. The receiver fet on the leather] 
foaked in water, — — J 
57 
S6 
1 6,000 
Exp. xui. Receiver placed on a leather foaked ] 
in water and fpirit of wine, - — J 
1 
57 
49 
1200 
The following table will fhew the comparative excel- 
lency between the pump on Mr. smeaton’s principle 
with which the chief of thefe experiments have been 
Vol. LXVII. 4 N tried, 
