70 
Report of the Judges on the 
The exhibitors elected to run at 60 lbs. pressure, at 120 revolutions, and at 
12-horse-power on the brake. 
The cylinder is placed on the fire-box. It is steam-jacketed, as are also 
the covers. The crank-shaft is a "bent" shaft, 3 inches in diameter, made 
of S C crown. It is carried on cast brackets, bolted on the front of the barrel. 
One pair of brasses are adjusted sideways, while those near the fly-wheel are 
adjusted vertically, as well as sideways. 
The four guide-bars are of wrought iron, case-hardened. The guide-blocks 
are of cast iron, with gun-metal wearing-pieces, and key-adjustments with set 
screws. 
The steam is taken direct from the top of the fire-box into the cylinder 
jacket, which is always open to the steam. From this jacket it is admitted 
by a slide-valve regulator, or starting-valve, into the slide jacket. 
Fig. 5. — Indicator-diagram of Messrs. TasJier and Sons' Portable Steam- 
Engine, No. 4991 (No. 2 diagram, 32 lbs. spring). 
The principal slide is of cast iron, and is a long slide, made up of two short 
slides cast together into one casting ; the exhaust from the two ends runs along 
the interior of the connecting casting to a central port in the slide, which 
travels opposite to a central eduction port in the cylinder facing. The whole 
length of the slide, except when two oiling grooves are chased across it, is in 
contact with the facing on the cylinder. On the back of this slide there are 
2 cast-iron expansion slides provided with nuts, in which lie, right and left, 
screws formed on the stalk, so that the expansion can be adjusted by hand 
while running. 
The engine is controlled by a governor and throttle-valve of the ordinary 
construction. 
The feed-pump is worked by its own separate eccentric; and is bolted 
on the barrel of the boiler, not far from the fire-box. The pump is always 
drawing, and the surplus water is returned to the pail by a cock, which can 
be regulated by means of a long handle which extends within the fireman's 
reach as he stands at the fire-box. From the rising valve of the pump a 
pipe proceeds into an annular jacket round about the waste-steam pipe, which 
runs along the top of the barrel of the boiler above the cleading. From the 
end of this jacket (which, it should be said, is nothing more than a 3-inch 
pipe) continues the 2-inch exhaust pipe. The feed-water goes from this 
jacket into a bent heater, extending round the inside of the smoke-box. The 
