548 Trials of Traction- Engines at Woherhampton. 
fireman, if he be steerins;, can see over tlic boiler, and has a j^erfect view of the 
road he has to travel ; but in the engine of Messrs. Howard, the enormous 
size of tlie waggon-shaped case of their safety boiler renders it absolutely 
impossible for the driver to see over it, and the most he could hope to do 
would be to obtain a glimpse round the sides of the case. We do not think 
it possible to safely steer the engine with the provision made for it. 
On coming into the yard, the ground being rather soft, the engine made 
itself a hole, and it required many hours of labour to extricate it and put it 
in position for the brake. When this was at length done, the boiler was proved, 
but it turned out to leak so much that the maximum proof could not be 
attained. We, however, having no doubt of the safety of the boiler allowed 
the engine to go to work, l)Ut the coupling for the universal shaft provided 
by the exhibitors broke. The Society then lent one of their couplings, which 
did not, however, fit the shaft, but with this the engine was again put to work. 
It made only a few revolutions when the band fly-wheel, which was a disc- 
wheel, suddenly and spontaneousl}' burst asunder, and the halves fell down, 
luckily injuring no one. On putting the halves together, it appeared that the 
wheel had been suftering from a large amount of strain, due to the contraction 
of the central part of the disc. This was shown by the fact that when the 
outer edges of the wheel were together, there was a space of from three- 
sixteenths to a quarter of an inch in the central part of the disc. 
Under the before-mentioned condition of things, it was of course impossible 
to allow the engine to compete ; but Jlessrs. Howard's representative and the 
Judges thought it would be very desirable to be in possession of the informa- 
tion to be obtained from a brake trial with so novel a form of boiler, and it 
was therefore arranged that Messrs. Howard's men should repair the boiler, and 
that a new fl}--wheel should be supplied. This was done, and on Wednesday, 
r)th July, the brake trial was made. The engine was declared to run at; 
30-hor.se-power and 150 revolutions a minute, and, as before stated, at 180 lbs. 
pressure. 
It consumed o"48 lbs. of coal per horse-power per hour. The indicator 
Diagram, given below, shows that 34-2G horse power were developed, giving 
Fig. 11. — Indicator Diagram of Messrs. J. and F. Hoicard's 10-Horse- 
jjoicer Locomotive, icith Safety Boiler, No. 1170. 
4-797 lbs. of coal per gross indicated horse-power per hour, the oil and tallow 
used were 1 lb. 8 ozs., being at the rate of 3*1 oz. per actual horse-power per 
day of ten hours. The water evaporated was 5'48 lbs. per 1 lb. of coals, as 
nearly as could be ascertained, for owing to the behaviour of the boiler it was by 
no means easy to be sure to a few gallons what the water evaporated really 
was. So long as no steam was being drawn from the boiler the water was tranquil 
iu the gauge ; but the moment the engine commenced to work, the water 
