708 
Report on Implements at Preston. 
the engine illustrated in section on pp. 34 and 35 of the last 
number of this ' Journal ' in being a surface condenser, while 
the other was an injecting condenser. 
" The Davey Motor which attracted inuch attention at the Shrewsbury Show 
last year, and was described in the Implement lieport ('Journal,' Xo. xli.), 
was this year tried upon the brake, and in recognition of its novel features 
and performances was awarded a silver medal. 
" Tlie engine tested (Catalogue Ko. 3959) was nominally 2-horse jjower, 
with cast-iron boiler, as in the Motor described on pp. 33 to 35. 
" The fuel used was ordinary gas-coke, and the cold water used for con- 
densing was wasted. A simple wood brake was applied on the edge of the 
fly-wheel, and after accurate balancing was loaded with a kno\\Ti weight 
acting at the periphery of a circle IS "33 feet circumference. With 3 lbs. of 
wood, and 24^ lbs. of gas-coke, the whole apparatus was warmed up and 
steam raised to atmospheric pressure (or, in otlier words, the water just began 
to boil under the ordinarj' pressure of the atmosphere), in 1 hour 3 minute?. 
The engine was then pulled round and started, and ran for the first 20 
minutes at 100 to 110 revolutions, with a load of 16 '2 pounds on the brake, 
corresponding to "95 horse-power, at 105 revolutions per minute. As it was 
apparent that the engine was then over-loaded, and in consequence unable to 
get up to its proper speed, the load was then reduced to 14 '2 lbs. on the 
brake, and the engine then ran for 4 hours at an average speed of 198 re- 
volutions per minute, corresponding to 1"56 horse-power. 'J'hus the mean 
power on the brake during 4} hours was 1 'ol horse-jTOwer. 'J'he estimated 
nett consumption of coke during the same time was 45 '5 lbs. For the 
purposes of the trial it was thouglit best to eliminate the first 20 minutes, 
and to estimate that the coke consumption was uniform, so that during the 
last 4 hours 42 lbs. was the nett consumption, or 10-5 lbs. per hour, which, 
at 1 ■ 5G horse-power, gives 6 " 7 lbs. of coke per brake horse-power per hour. 
" The consumption of condensing water was tested several times during the 
trial, and was found to average 4 •05 gallons i>er minute, or 156 gallons per 
horse-power per hour; the average rise of temperature being 38 '5 degrees 
Fahrenheit, from 623" to 101°, and the vacuum averaged 23j inches. For a 
short time, as an experiment, the condensing water was reduced to 100 
gallons per horse-power per hour, with a rise of temperature of from 61° or 62° 
to 123°, but the engine would not work well with so little water, and the 
vacuum fell to 222". The results recorded should be treated as appro.xima- 
tions, as for several reasons it was not practicable to conduct the trial with 
the same precautions and precision as have been observed in the mpst recent 
competitive trials of steam-engines. In abstract the results are as follows: — 
Engine 
Time occupied in raising steam .. 
Fuel consumed in raising steam .. 
Duration of official trial 
Average speed in revolutions per minute 
Average horse-]iower on brake 
Average weight of gas-coke consumed 
per brake liorse-power per hour 
Average ste ira pressure 
Average vacuum 
Average terw^ierature of injection .. 
„ „ „ hot well .. 
Average rise in temperature of conden- 
sing water 
Average rise in hot well water discharged 
per horse-power per hour 
2 horse-power nominal. 
1 hour 3 minutes. 
3 lbs. of wood and 24J lbs. of coke. 
4 hours. 
198. 
1-5G. 
6-7 lbs. 
Eather below atmosjihcrc. 
23i inches. 
62-5°. 
101°. 
38-5° 
156." 
