It has great strength
and resistance, owing to the fact that no pressure is exerted on the
journals on which the steam cylinders oscillate, and all the pressure
from the steam pistons is directly transferred to the crank-pins on the
driving-wheels. The engine is perfectly balanced in any position during
the stroke, and it may therefore be run at a much higher speed than the
common engines now in use."
* * * * *
GAS MOTORS AND PRODUCERS.
By C.W. SIEMENS, London.
The cylinder of the engine--assuming that it has only a single-acting
one, placed with its axis vertical--consists of two parts; the upper hot
part being lined with plumbago, fire-clay, or other refractory material,
and the lower part kept cool by a water casing. The cylinder has a trunk
piston working in the lower part, and on its upper side a shield that
almost fills the hot part of the cylinder when the piston is at the
extreme of its upstroke. The trunk-rod of the piston passes through a
stuffing-box in the cylinder bottom, and is connected to a crank on the
engine-shaft; and this (unless multiple cylinders are employed) carries
a heavy fly-wheel.
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