1 
190 
yi'ECIKIC IIBAr OP OASJi?. 
Section VI. 
■Dclermifiation oj' the specific Heat of Gas compared fo that of 
IHater. 
S 1- 
First Method. 
Sp, 
’cific 
'<f iras coin- 
Iirat In the conclusion we have drawn of the proportions of the 
pari'd to wa- specific heat of the different gases, we set off with this pnn- 
Iir. 
ciple — that this specific heat was proportional to the maxnnum 
of the elevation of the teaiperature to which a hot current of 
each gas would carry the calorimeter; to connect these specific 
heats with that of water, it was sufficient, therefore, to com- 
j)are the effects produced by the different gases with that which 
a current of hot water, so gentle, that its effect should not be 
much more considerable, would produce; 
We had obtained a very gentle current of water by means 
of a capillary syphon, plunged into a vase full of water at a 
constant level. This current was heated by passing through 
a tube filled with the vapour of water, and afterwards passed 
through ihe calorimeter. Between the tube which heated this 
current and the calorimeter, the current passed through a pas- 
sage of about fifteen centimetres, where a convenient apparatus 
had been di.sposed to lake the temperature very exactly. On 
quitting the calorimeter, tlte water passed by a lube formed i» 
a point, into a graduated lube, which served to measure the 
rate of the current. 
From the experiment made by this process it appeared, that 
a current of water of 37750 grammes in ten minutes, having 
been cooled by 29 ° 0 / 2 , maintained the temperature of the calo- 
rimeter 20°7'3 above that of the ambient air. In com- 
paring this result with that obtained with , the current of air 
presented by the first table, taking care first to turn the litre# 
into grammes, we find, 
Th« 
i) 
