Making a Governor.
[Illustration: FIG. 66.--Elevation of governor for horizontal engine.
Above is plan of valve and rod gear.]
It is a great advantage to have the engine automatically governed, so that
it may run at a fairly constant speed under varying loads and boiler
pressures. In the absence of a governor one has to be constantly working
the throttle; with one fitted, the throttle can be opened up full at the
start, and the automatic control relied upon to prevent the engine knocking
itself to pieces.
The vertical centrifugal apparatus shown in Fig. 66 was made by the writer,
and acted very well. The only objection to it is its displacement of the
pump from the bed. But a little ingenuity will enable the pump to be driven
off the fly wheel end of the crank shaft, or, if the shaft is cut off
pretty flush with the pulley, off a pin in the face of the pulley.
Turning to Fig. 66, A is a steel spindle fixed in a base, L, screwed to the
bed. B is a brass tube fitting A closely, and resting at the bottom on a
1/4-inch piece of similar tubing pinned to A.
A wooden pulley jammed on B transmits the drive from a belt which passes at
its other end round a similar, but slightly larger, pulley on the crank
shaft.
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