200 R. Clausius on the Application of the 
we have 
= SAU od 
= es 
LF 
7, ==1=z 
and we therefore obtain 
M+ 
oe Y ee 1-z | 
ET log phe) p 
= G4 9+F +e) 
Zz 
zZ 22 Zs 
odie Rh | 
Sa BAW GES as 
Equation (25) or (X1) thus becomes 
(27) W=m,r, Zt Me(,-7.)5-( 
1 Z g2 
tists 
é Y expansion to the temperature of the condenser, 
without following singly the different processes of which the 
circular process consists. In this case, namely, the circular pro- 
cess 1s invertible in all its parts—we may imagine that the evap- 
oration takes place in the condenser at the temperature 7’,, and 
that the mass I, of which the part m, is va r, and the part 
(M4—m,) is liquid, passes into the cylinder, org lifts the piston ; 
that then during the descent of the piston, the steam is first — 
all pump, the 
boiler into the condenser, an 
