8 6 
Count Rumford's Inquiry concerning 
hole made to receive it, in the side of the cylinder, when the 
mercury rose almost instantly to 130°. 
Though the heat could not be supposed to be quite equally 
distributed in every part of the cylinder, yet, as the length of 
the bulb of the thermometer was such that it extended from 
the axis of the cylinder to near its surface, the heat indicated 
by it could not be very different from that of the mean tempera- 
ture of the cylinder ; and it was on this account that a thermo- 
meter of that particular form was chosen for this experiment. 
To see how fast the heat escaped out of the cylinder, (in or- 
der to be able to make a probable conjecture respecting the 
quantity given off by it, during the time the heat generated 
by the friction was accumulating, ) the machinery standing still, 
I suffered the thermometer to remain in its place near three 
quarters of an hour, observing and noting down, at small in- 
tervals of time, the height of the temperature indicated by it. 
Thus, at the end of 
The heat, as shown by 
the thermometer, was 
4 minutes - 
after 5 minutes, always reckoning from the 
first observation, 
at the end of 7 minutes - 
126° 
12 
and when 41 minutes had elapsed 
20 
24 
28 
3 1 
M 
14 
16 
11 9 ° 
118 0 
116° 
ii5° 
114° 
11 q° 
11T 
no 0 
