The interior
of the slide also, by means of a second port at its upper part,
communicates alternately with the tops of the two cylinders; this
communication being in each case made while the piston is performing the
first portion of its downstroke. During the upstroke of each piston the
slide, by means of another port, makes communication alternately to each
cylinder from the bottom of the slide casing, and by means of a fourth
port make communication alternately from each cylinder to the top of the
slide casing. In the passage connecting the top of the slide casing
to each cylinder is placed a regenerator, consisting of a number of
perforated metal plates or sheets of wire gauze.
[Illustration: SIEMENS' GAS PRODUCER AND GAS MOTOR. Fig 1.]
In order that gas of poor quality or gas diluted with a large proportion
of air may be utilized, an igniting arrangement is employed which
operates as follows: I is a vessel containing a supply of hydrocarbon
oil, preferably of volatile character. From this vessel pipes lead to
two cocks, one for each cylinder; these corks being caused to revolve in
time with the engine-shaft by a chain, M, communicating motion from a
wheel on the engine shaft to a chain-wheel of equal size on the spindle
of the two cocks.
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