The cylinder and steam chest of this engine are cast in one piece and
bolted securely to the engine frame, which forms the front cylinder
head. The cylinder is lagged with mineral wool and jacketed to prevent
radiation, and it is overhanging and self-lining.
The valve is a hollow piston valve, the body of which is steel
tubing with cast iron ends. It receives its motion from the shaft
governor, attached to one of the band wheels, which regulates the
cut-off automatically according to the variation of load. The steam
is exhausted at each end of the valve by very direct passages which
quickly free the cylinder, preventing back pressure.
The engine frame is cast heavy and rigid, and contains the locomotive
guides for cross-head and the pillow block bearings for the crank shaft.
The double disc center crank shafts allow of two small heavy band
wheels being used.
The base of this engine is cast in one piece, to which the engine frame
is securely bolted, and with this arrangement, the engine needs no
expensive foundation.
The engine is simple and self-contained, ranging in sizes from 11 to
450 horse-power, and is intended to run at the very high speed of
from two hundred to three hundred and fifty revolutions per minute
according to size, and is used extensively in driving electric lighting
machinery, and where high speed and continuous work is desired.