: 
5 TENG eS Sain tel ee a aie 
Sag 
W. A. Norton on Ericsson's Calorie Engine. 399 
3. Since the two connected pistons are of unequal size, and 
the elastic force of the air pressing upon them the same or nearly 
sire, and the two pistons are urged up with a force equal to the 
difference of these pressures. This statement is here made with 
5, hen the engine has reached its permanent working state 
the quantity of air admitted into the working cylinder each up- 
© teceiver, from the supply cylinder, during the same interval. 
pies it must be less, by reason of the waste from leakage and 
anc 
é. 
Now it will be perceived that if this quantity of air, after being 
admitted-into the working cylinder, as just supposed, retained the 
quantity Originally filled the supply cylinder, at this pressure. 
Bat if We suppose its temperature to be elevated 480°, or there- 
chamber, its elastic foree would be doubled, or amount to 30 lbs. 
Per square inch, To realize this supposition the ‘compressed air 
30 receiver must therefore have an expansive force of over 
. lbs., or 15 lbs. above the atmospheric pressure. If the work- 
ng temperature in the lower cylinder were 384° above the tem- 
“ture of the external air instead of 480°, then the pressure in 
iit eylinder, and of necessity therefore in the receiver, wou 
It Ibs. above the atmospheric pressure, (i.e. 3¢3ths of 15 lbs.) 
Will be seen then that the working pressure in the receiver 
oe Working temperature.in the principal cylinder are neces- 
“nly connected together—that the one determines the other 
‘Cis here supposed that there is no leakage or clearance, but 
the fact is Otherwise; and therefore the quantity of air admitted 
the working cylinder, each ascending stroke, is less than 
