Put valve in position and draw it forward till the port is exposed.
Turn the eccentric forward, and mark the rod opposite centre of valve pin.
Bore hole for pin, and insert pin.
Hold the crank shaft firmly, and revolve eccentric till the port just
begins to open on its forward stroke. Rotate crank disc on shaft till the
crank pin is full forward.
Solder eccentric and disc to shaft.
Solder steam pipe to cylinder, and a brass disc to the rear end of the
cylinder.
Fit a fly wheel of metal or wood. This must be fairly heavy, as it has to
overcome all friction during the return or exhaust stroke.
Action of Engine.--During the forward motion of the piston the valve is
pushed back by the eccentric until the steam port is fully opened, and is
then drawn forward, covering the port. At the end of the power stroke the
port has begun to open to the air, to allow the steam to escape throughout
the exhaust stroke, in the course of which the valve is pushed back until,
just at the end of the stroke, the steam port begins to open again.
Notes.--
(l.) The connecting rod may be made shorter than shown in Figs.
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