and its energy in foot pounds amounts to about 8.6 times its weight.
The cylinder is steam jacketed on the body and ends, and is fitted with
Corliss valves and Inglis & Spencer's automatic Corliss valve expansion
gear. Referring to the general drawing of the engine, it will be seen
that the cylinder is bolted directly to the end of the massive cast iron
frame, and the piston coupled direct to the crank by the steel piston
rod and crosshead and the connecting rod. The connecting rod is 28
feet long center to center, and 12 inches diameter at the middle. The
crankshaft is made of forged Bolton steel, and is 21 inches diameter at
the part where the fly-wheel is carried. The fly driving wheel is 35
feet in diameter, and grooved for twenty-seven ropes, which transmit the
power direct to the various line shafts in the mill. The rope grooves
are made on Hick, Hargreaves & Co.'s standard pattern of deep groove,
and the wheel, which is built up, is constructed on their improved plan
with separate arms and boss, and twelve segments in the rim with joints
planed to the true angle by a special machine designed and made by
themselves. The weight of the fly-wheel is about 60 tons. The condensing
apparatus is arranged below, so that there is complete drainage from the
cylinder to the condenser. The air pump, which is 36 inches diameter and
2 feet 6 inches stroke, is a vertical pump worked by wrought iron
plate levers and two side links, shown by dotted lines, from the main
crosshead. The engine is fenced off by neat railing, and a platform with
access from one side is fitted round the top of the cylinder for getting
conveniently to the valve spindles and lubricators. The above engraving,
which is a side elevation of the cylinder, shows the valve gear
complete. There are two central disk plates worked by separate
eccentrics, which give separate motion to the steam and exhaust valves.
The eccentrics are mounted on a small cross shaft, which is driven by a
line shaft and gear wheels. The piston rod passes out at the back end of
the cylinder and is carried by a shoe slide and guide bar, as shown more