Force of Steam. 9 
the same apparatus with the water reduced to 
the common boiling point. Having renewed 
the water in the refrigeratory, and ascertained 
its temperature at 53°, the thermometer in 
the boiler standing at 212°, the steam was let 
into the worm till 6 ounces had come over. 
During the experiment, the thermometer in 
the boiler fluctuated between 212° and 215°. 
I estimated the medium, taking the whole 
experiment together, at 213°. When the 6 
ounces of condensed water had come over, the 
temperature of the refrigeratory was carefully _ 
ascertained to be 74°, having been raised 
21° by 6 ounces of steam at 213°. Making 
the calculation as before, the result gives 910° 
of latent heat, leaving a difference of 10° in 
the latent heat between this and the former 
experiment, which is as near as it is possible 
to come in experiments of this description, 
and with this sort of apparatus. Some of- the 
former experiments had given the difference 
in favour of steam, at the common boiling 
temperature. I conceive, therefore, it may 
be safely concluded, that there is as much 
latent heat in a given weight of steam, raised © 
from common boiling water, as in that of a 
much higher temperature; and that, when 
once steam is saturated with the specific quan- 
tity of heat necessary to its formation, all 
B 
