342 Silliman and Wurtz on Flame Temperatures. 
In this discussion we have occasion to use the numbers repre- 
senting the specific heats of but three gases, the three, namely, 
which remain after complete combustion, steam, carbonic acid and 
nitrogen ; as we must assume that in the hottest and most lumi 
nous zone or shell of the flame, there is no oxygen in excess to 
be heated. These three numbers are, according to Regnault’s 
latest determinations, for equal weights o 
Steam 0°4805 
Carbonic acid _--- . 0°2163 
itrogen 0°2438 
(Liquid water being 1:0000) 
This means that the amounts of heat which would raise one 
pound of water and steam to the same degree are in the ratio of 
0°4805 for the pound of steam, and 1 for the pound of water. 
simple proportion : 
9X (sp. heat of steam=0-4805) : 34462° :: (sp. heat of water=1):# 
: 34462° sag oe 
| Taos = 7960" C.* = 14876" F. 
a number which, we may add, represents the maximum of heat 
capable of being imparted theoretically to liquid water by the 
flame of Hare’s oxyhydrogen blow-pipe. 
Still, we have by no means here the actual temperature of 
the free or oF flame of Hare’s blow-pipe, which is generally 
lower than this { ; as we have not yet taken into account 
the latent heat, or heat of vaporization, of the 9 Ibs. of steam 
formed. The Centigrade temperature necessary to convert 1 1b. 
. At “ 2). gives this number 
Tee menpdig mquyogen ge opie 
Steam, namely, 0-475, apparently an earlier determination of I 
ine aks catee. wanes 
Or; == 
rection necessary in this case for the latent heat of steam of comous: 
ined in the text above. This oversight has doubtless been corrected cited 
ed author, but we have been unable to ascertain where the CoF 
.- 
