(OsrQ'. 
0 % 
24, r 
£) 2 Count Rumford's Inquiry concerning 
had been raised no less than 47 degrees ; being now 1 0 7 0 of 
Fahrenheit’s scale. 
When 30 minutes more had elapsed, or 1 hour and 30 mi- 
nutes after the machinery had been put in motion, the heat of 
the water in the box was 142 0 . 
At the end of 2 hours, reckoning from the beginning of the 
experiment, the temperature of the water was found to be raised 
to 178°. 
At 2 hours 20 minutes it was at 200°; and at 2 hours 30 mi- 
nutes it ACTUALLY BOILED ! 
It would be difficult to describe the surprise and astonish- 
ment expressed in the countenances of the by-standers, on 
seeing so large a quantity of cold water heated, and actually 
made to boil, without any fire. 
Though there was, in fact, nothing that could justly be con- 
sidered as surprising in this event, yet I acknowledge fairly 
that it afforded me a degree of childish pleasure, which, were I 
ambitious of the reputation of a grave philosopher, I ought most 
certainly rather to hide than to discover. 
The quantity of heat excited and accumulated in this expe- 
riment was very considerable; for, not only the water in the 
box, but also the box itself, (which weighed l^lb.) and the 
hollow metallic cylinder, and that part of the iron bar which, 
being situated within the cavity of the box, was immersed in 
the water, were heated 150 degrees of Fahrenheit’s scale; 
viz. from 6 o° (which was the temperature of the water, and of 
the machinery, at the beginning of the experiment, ) to 2 1 o Q * 
the heat of boiling water at Munich. 
The total quantity of heat generated may be estimated with 
some considerable degree of precision, as follows : 
