This pulley is accommodated by moving the eccentric slightly nearer
the crank and shortening the fly-wheel side bearing a little.
The piece G, fixed to B by a lock screw, has two slots cut in it to take
the upper ends of the weight links DD; and C, which slides up and down B,
is similarly slotted for the links EE. Each of the last is made of two
similarly shaped plates of thin brass, soldered together for half their
length, but separated 3/32 inch at the top to embrace the projections of D.
To prevent C revolving relatively to B, a notch is filed in one side of the
central hole, to engage with a piece of brass wire soldered on B (shown
solid black in the diagram). A spiral steel spring, indicated in section by
a number of black dots, presses at the top against the adjustable collar F,
and at the bottom against C.
The two weights WW are pieces of brass bar slotted for driving on to DD,
which taper gently towards the outer edge.
When the pulley revolves, centrifugal force makes WW fly outwards against
the pressure of the spring, and the links EE raise C, which in turn lifts
the end of lever M.
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