The vapor gradually condenses
at the bottom of the vessel, Y, and the water so formed is drawn by the
pump, J, along the suction pipe, P9, and forced through the pipe,
P8, back to the chamber, Y, through the valve, A1, and in the form
of spray plays on the tubes, T, and absorbing any residual heat. The
heat generated by compression in the cylinder, C, is absorbed by a spray
of water from the pump, H, the vapor being carried along with the air
through the pipe, R, to the chamber, Y, where it is separated, and
falling to the bottom is circulated, as just described, by the pump, J.
X is a small auxiliary air compressor, to obtain the necessary
compression to start the engine, and is worked from the boiler, W. In
future engines this compressor will be superseded by a specially
designed injector, which will produce the necessary pressure at a
considerable reduction in cost. When once the engine is started, the
fire of the auxiliary boiler can, of course, be drawn, as the main
engine afterward makes its own steam. The regenerator, E, has circular
ends of fire clay perforated, the body being filled with fire clay
spirals of the shape clearly shown in elevation in Fig. 2. The injector
valve for the creosote is shown to a larger scale in Fig. 3. This valve
has, however, been since considerably modified and improved.
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