34 R. Clausius on the Application of the 
denser is about equally distant from the temperature of the 
boiler and that of the condenser. We will accordingly —_ to 
water, the value which according to Regnault represents 
cific heat at an putting 
ce==1°0130. 
To locties ah r, we set out from the equation which 
Regnault has mtatished for the whole quantity of heat which 
is necessary in order to warm a unit of weight of water from 0° 
to the temperature ¢, and to convert it into steam at this temper- 
ature, namely, 
4 = 606°5 + 0°305.t. 
If we substitute in this for 4, the sum corresponding to the pre- 
t 
vions definition St cdt-+7, we have 
Oo 
t 
r— 6065 + 0°305. t— feat. 
We must apply in the interval forc, the temperature function 
more accurately determined by Regnault, in order to obtain ex- 
actly the values of r which Regnault gives. I believe however 
that it is sufficient for our present ot Deepens, to employ in this case 
nce we obtain 
t 
fedt=vo1s. t 
may now contract into one the two Ag = the preceding 
equation depending on ¢, which reads —0-708 
We must, at the same time, also change norreital the Tar aul 
term of the equation, and we will so determine it that that 
servation-value of r which is probably most accurate of all is 
P5902 536'2.* 
By employing = value, we obtain for r the formula 
* = 607 —0°708 . t. 
sci tat ~ some of the values calculated from this with 
thoes given by Regnault+ in his table will show that this simpli- 
— t his table the above number but 536: 
no oe in pr pin num 
Cag cx 
‘This arises 
value 636°67 ee ere 
+ Mém. de l’Acad. des Sciences, T. xxi, p. 
