When either
piston is at the top of its stroke, the revolving valve admits to the
upper part of the cylinder a supply of the gaseous mixture from the
reservoir and valve casing, and this passes through the generator. At
the same time a portion of the charge passes by the pipe, and becomes
enriched by admixture of the hydrocarbon oil delivered to it by the
cock. The enriched mixture, in passing the platinum wires, which at that
time give an electrical spark, is ignited, and ignites the charge that
is passing through the regenerator into the cylinder. The mixture thus
ignited expands, and acting on the full area of the piston propels it
downward, the under side of the piston being at that time subject to
pressure only on its annular area. When the piston has completed its
down-stroke the passage is opened to the discharge-pipe, and the
expanded products of combustion then pass from the cylinder through the
regenerator, and are discharged. In their passage they give out to the
regenerator a large portion of their heat, which the charge entering
the cylinder for the next stroke receives in passing through the
regenerator.
[Illustration: SIEMENS' GAS PRODUCER AND GAS MOTOR.
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