OF STEAM-ENGINES WITH DEY SATUEATED STEAM. 
191 
Example II. — Screw-steamer of about 700 tons displacement (1), with engine of 226 
indicated horse-power. 
Bottom of cylinders. 
Top of cylinders. 
Data : — 
lb. on the square inch. 
^i-j-144 
1081 
104 
^3-r-144 
3-3 
4-0 
r 
16 
14 
T,=^,-461-2 = 
122° Fahr. nearly. 
Kesults by exact formula : — 
Bottom of cylinders. 
Top of cylinders. 
v^=rv^ 
64-27 
58-52 
i),-144 
5-6 
6-3 
W 
191437 
182108 
W w 
20-7 
21-6 
144^2 144 
Mean .... 
. 21-15 
Observed mean effective pressure, lb. on the inch . 
. 21-0 
Difference . . 
.+ 0-15 
975301 
966524 
:j-^ = AA-144 
105 
115 
144^2 
Mean .... 
. 110 
E=w-^A 
0-196 
0-188 
mean w 
Mean efficiency 
0-192 
Example II., calculated by approximate formula. 
Data ; — lb. per inch. 
Mean . . . j9i-f-144 106^ 
Mean . . . j93-^144 3‘65 
Mean ... - 0-067 
r 
KeSULTS .- — lb. per inch. 
w-r-144, Calculated 21-05 
Observed 21-00 
Ditference + 0-05 
A-^144 110 
E 0^ 
