' for adjujiing Thermometers . 823 
whenever there was any, the greater height was when 
the water boiled fait; the difference, however, never 
amounted to more than ^th of a degree. 
There was fcarce ever any fenfible difference whether 
the fliort thermometers were tried in the fliort pot or the 
deep one, though in the former cafe the ball was raifed 
very little above the furface of the water, and in the lat- 
ter not lefs than 14 inches : neither did we find any fen- 
fible difference in trying them in the tall pot, whether 
there was a greater or lefs depth of water in the veffel. 
As it was neverthelefs fufpe£ted, that the heat of the 
fleam might poffibly be lefs near the top of the pot than 
lower down (for in thefe experiments the ball of the 
thermometer was always at the fame depth below the 
cover, though its height above the furface of the water 
was very different) we made two holes in the fide of a 
pot four inches deeper than the deepeft of the foregoing, 
one near the top of the pot, and the other not far from 
the bottom, and paired the ball of the thermometer 
through one or the other of thefe holes, taking care to 
flop up both holes very carefully, fo that no air could 
enter into the pot by them : no fenfible difference could 
be perceived in the height, whether the thermometer 
was placed in the upper or lower hole, though in one 
3.. cafe 
