The Trials of Light Portable Motors at Plymouth. 587 
Results of the Trials 
Simpson, 
Strickland it Co., 
Dartmouth, 
1st prize 
E. R. & F. 
Turner, 
Ipswich, 
2nd prize 
Adams it Co., 
Northampton 
Duration of trial, minutes . . . 
210 
210 
174 
Boiler 
Mean steam pressure above at- \ 
mospbere, lb. per sq. in. . . J 
Mean steam pressure absolute . 
Mean temperature of feed Fabx. 
„ „ steam Fahr. 
Rise of temperature of feed due > 
Ash found at end of trial, lb. 
1011 
11G-2 
G316° 
339 0° 
7-7° 
92o 
807 0 
375 
60 60 
75-43 
62-4° 
30S-3° 
74° 
153-25 
1,172-5 
2-87 
75 00 
89-76 
57-5° 
320-2° 
none 
173-75 
1,038-5 
70 
Brake 
Diameter of brake wheel, ft. . . 
Main spring balance reading, lb. 
2011 
91-75 
7-81 
86 91 
5012 
2- 559 
84 
601 
77-99 
3- 997 
3142 
136-75 
20 7 
11605 
5 003 
Engine 
Revolutions per minute . . . 
Mean effective pressures from in- 
dicator, lb. per square inch : — 
(not taken) 
298 1 
46 66 
4512 
44,190 
210-4 
43 06 
40-26 
25,088 
114-2 
23-80 
2101 
45-89 
41-66 
22-40 
11-41 
1083 
— 
1112 
Indicated horse-power : — 
V\ _ . ' TT T 1 
1-502 
1-363 
1-433 
1-313 
2-724 
2'151 
3-344 
2 857 
5 611 
5-175 
6-201 
a bad engine, or vice versa, and, before any sound opinion can be 
formed of the general results, the two efficiencies must be con- 
sidered separately, and their relative importance adjusted. 
In determining the efficiency of the boiler, we have only to 
take account of the coal used and the feed water supplied and 
evaporated. 
442 
