1--SECTIONAL ELEVATION--HARGREAVES' THERMO-MOTOR.]
[Illustration: Fig. 2.]
The action of the machine is as follows: Assuming the engine to be in
condition for starting, the sides of the combustion chamber, D, are red
hot, the chamber charged with air, and the spray of creosote, injected
by the pump, F, is ignited; the expansion of the gases produced by the
combustion acts upon the bottom of the piston, B, forcing it to the top
of the cylinder, and thus, by intermediate mechanism, causing the crank
shaft to revolve. By the same stroke a charge of air is forced by the
compressor, C, into the receiver through the pipe, R. The cylinder is,
of course, single acting, and on the down stroke of the piston, B--which
falls by its own weight and the momentum of the fly wheel--the exhaust
gases are forced through the regenerator, E, which absorbs most of their
heat; they then pass through the exhaust valve, placed immediately under
the feed valve, M, along the pipe, Q, up through the pipes, T, fitted
into the receiver, V, down the pipes, T, fitted into the saturator, Y,
and out of the funnel fixed to the bottom of Y.
[Illustration: Fig 3.]
[Illustration: Fig. 4.]
The charge of air for supplying the combustion chamber is forced by the
compressor, C, through the pipe, R, _outside_ the tubes, T, in the
chambers, V and Y, along the pipe, P, through the feed valve, M, and the
regenerator, E, into the combustion chamber.
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