PHYSICAL ann LITERARY. 161 
dered very remarkable.. The cold produ- 
‘ced was alfo obfetved to be ftill greater, 
when, between each dipping, the thermo~ 
meter was moved very nimbly to and fro 
in the air; or if, while the ball was wet 
with fpirit of wine, it was blown upon by 
a pair of bellows, or indeed if the air a- 
bout the ball was otherwife any how put 
in motion. If any of thefe means for 
putting the air in motion are employed; 
the repeated moiftenings of the ball of the 
thermometer’ may be performed by dip- | 
ping it into the fpirit of wine. But, when | 
a certain degree of cold has been produ- 
ced by a firft dipping, that is apt to be 
- diminifhed by dipping again into. the 
‘warmer {pirit; and therefore the thermo- 
meter ought either to be dipped into the 
fpirit and taken out again very quickly, 
or, what is ftill better, the ball of the ther- 
mometer ought to be moiftened by a fea- 
ther that has been dipped into the fpirit 
of wine. By taking thefe methods, I have, 
by fpirit of wine, made the mercury in the 
_ thermometer fink from 44 degrees to be-: 
low the freezing point; and, by employing 
PV ou, Il. X 
fome © 
