[ 8 3i ] 
as the fpirit ; and continued to rife for iome time after 
the others became flationary. 
I electrified the bars of the inftrument, to fee if 
the electrical fire could produce any degree of heat 
fufficient to expand them ; which, on the firfl trial, 
it feemed to do, by the minute index riling 6 divi- 
fions in a fhort time. But as I had fome reafon to 
imagine ; that this appearance proceeded rather from 
an increafe of heat, occafioned by two gentlemen 
being in the room with me, when I made the expe- 
riment ; I repeated it alone the next day, leaving the 
door open at the time, and could not perceive the 
minute index to rife above one divifion ; which I 
attribute rather to the warmth that my being in the 
room had occafioned. 
I tried the expanfion of a few metal bars, from 
artificial freezing, with pounded ice, and water that 
it diffolved into ; upon which was poured half an 
ounce of fpirit of tartar, in which Fahrenheit’s ther- 
mometer defcended to within one degree only of the 
freezing point: to boiling water, in which it rofe 
to 2ii°, though the water did but fcarce boil, for 
want of a fufficient number of lamps. The baro- 
meter flood at 30 inches, and the natural heat of the 
weather at 6 o° of Fahrenheit. 
Divifion?. 
* A bar of fpelter 2 feet long, marked by the j 
minute index — — ■ — — — — j 
1570 
Spelter 18 parts, and copper 2 parts, accord-") ^ Q . 
inp; to the founder’s account — — — j 
ing 
Brafs 
1120 
* This was the bar, found, on breaking, to be hollow. 
Iron 
