51 and 52; but in that case the piston also must be shortened to allow for
the greater obliquity of the rod at half-stroke.
(2.) If two opposed cylinders are made to operate the one crank, a
double-acting engine is obtained. Both valves may be operated by a single
eccentric, the connecting rod of one being pivoted to a small lug
projecting from the eccentric strap. If three cylinders are set 120 degrees
apart round the crank shaft, a continuous turning effect is given. This
type will be found useful for running small dynamos.
(3.) If it is desired to use the exhaust steam to promote a draught in the
boiler furnace, it should be led away by a small pipe from the rear end of
the valve tube.
XV. A HORIZONTAL SLIDE-VALVE ENGINE.
The reader who has succeeded in putting together the simple engine
described in the preceding chapter may wish to try his hand on something
more ambitious in the same line. The engine illustrated in Figs. 53 to 66
will give sufficient scope for energy and handiness with drill and
soldering iron. The writer made an engine of the same kind, differing only
from that shown in the design of the crosshead guides, without the
assistance of a lathe, except for turning the piston and fly wheel--the
last bought in the rough.
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