642 Mr. nairne’s Account of 
The receiver was then taken off from the pump-plate, 
and a blank fcrew fcrewed into the hole in the pump- 
plate. 
EXPERIMENT LVII. 
The pump was then worked for ten minutes without 
any receiver on the pump-plate. The barometer-gage 
alone being afterwards connedted with it, the gage indi- 
cated a degree of exhauftion of 50 only, which was the 
fame as in the laft experiment; fo that the ( bad effects of 
ths mixture of the fpirit of wine and water ftill con- 
tinued. 
I then poured about two fpoonfuls of oil down the 
hole in the pump-plate, and the piftons were worked 
gently till molt of the oil had paffed through the pump 
into a relervoir made to receive it. A blank fcrew was 
then fcrewed into the hole in the pump-plate as before, 
and after the pump had been worked for a minute or 
two, four or five times, the air being let in between 
each time, the oil had then wafhed fo much of the moif- 
ture out of the infide of the pump, that I was now able 
to exhauft to 430 inftead of only 50 times, as before the 
oil had been made to pafs through it. 
During the courfe of thefe experiments on the air- 
pump it appeared, by the teftimony of the pear and baro- 
3 meter- 
