8 Experiments on the 
over, the cock was stopped, and the tempera- 
ture of the water in the refrigeratory accu- 
rately noted, and found to be 81°, being raised 
26° by the 7 ounces of steam. During the 
experiment, the thermometer in the boiler felt 
from 276° to 274°, making the medium 275° 
for the sensible heat of the steam which passed 
through the worm. Had this steam contained 
no latent heat, it would have raised the tem- 
perature of the water in the refrigeratory only 
5° anda small fraction; but it did, in fact, 
raise it 26°, and the result in figures gives 
920° for the latent heat of the steam. If the 
latent heat of steam above the boiling point in- 
creased in proportion to its elasticity or force, 
the above experiment ought to have indi- 
cated considerably more than 2000° latent 
heat ; but it will necessarily be remarked, that 
the quantity djd not amount to the 940° con- 
tained in steam at the common boiling tem- 
perature, according to the authority of Mr. 
Watt. This difference, however, is easily ac- 
counted for by a sinall portion of heat, neces- 
sarily given out during the experiment from 
the metal tube which conducted the steam 
from the boiler into the worm, and another 
small portion from the surface of the water in 
the refrigeratory. In order to remove any doubt 
im this respect, I repeated the experiment in 
. i 
