A single link, N, transmits the motion from a pin on M
to the double bell-crank lever O (see Fig. 66) pivoted on a standard, P,
attached to the bedplate. The slotted upper ends of P engage with pins on
an adjustable block, R, which moves the governing valve V (solid black),
working in the tube S through a gland. The higher M is raised the farther
back is V moved, and its annular port is gradually pushed more out of line
with two ports in the side of the valve tube, thus reducing the flow of
steam from the supply pipe to the cylinder connection on the other side of
the tube. This connection, by-the-bye, acts as fulcrum for lever M, which
is made in two parts, held together by screws, to render detachment easy.
The closer the fit that V makes with S the more effective will the
governing be. The gland at the end of S was taken from an old cylinder
cover.
Regulation of the speed may be effected either
(1) by driving the governor faster or slower relatively to the speed of the
crank shaft;
(2) by altering the position of W on D;
(3) by altering the compression of the spring by shifting F;
(4) by a combination of two or more of the above.
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