We give the aspect
of it in Fig. 3. In the first period the mixture of air and gas is
sucked in, in the second it is compressed, in the third it is ignited,
and in the fourth the products of combustion are expelled.
[Illustration: FIG. 2.--SIMPLEX MOTOR, DOWSON GENERATOR OF 100 INDICATED
H.P.--ELEVATION AND PLAN.
A, cylinder; B, gas conduit; C, rubber pockets; D. gasometer; E,
purifier; F, scrubber; G, hydraulic main; H, cooling pipe; I steam
injector; K, steam boiler and superheater; L, gas generator; M, charger;
N, discharge of the motor.]
Ignition is effected electrically by a series of sparks playing between
two platinum points in the slide valve, and this permits of regulating
the instant of ignition through the edges of the orifices. The angular
velocity is regulated by a Watt's governor, which secures an isochronism
of the motion independently of the charge.
The setting in motion of so powerful an engine is effected very easily
by means of an arrangement that permits of introducing into the
cylinder, while the piston is in the center of the stroke, a mixture of
air and gas whose pressure is sufficient at the arrival to expel the
inert products.
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