r flywheel, with a governor resting in the upper recess, was
pressed onto the crankshaft. As the operator of the vehicle had no
control over the carburetor once he climbed into the seat, this governor
was necessary to maintain regular engine speed. Its function was to move
a slide on the exhaust-valve unit to prevent the valve from closing.
Thus the engine, with the suction broken, could not draw a charge on the
next revolution. During the recent restoration of this carriage it was
found that while most parts are still intact, nearly all of the
governor parts are missing. A description of them must therefore be
based on the recollections of Frank Duryea, along with certain evidences
seen on the engine.

[Illustration: FIGURE 19.--UNDER SIDE of exhaust valve mechanism showing
electrical contacts that give spark only on every other revolution.]

Just on top of the flywheel, and surrounding the crankshaft, rest two
rings, 3-7/8 inches in diameter. Into the opposing surfaces of these
rings are cut a series of small inclined planes, appertinent to each
other. On the outer circumference of the upper ring two pins pass
through a pair of lugs mounted in the flywheel, causing the ring to
rotate with the flywheel, yet permitting vertical movement. Underneath,
the other ring is allowed to turn slightly when, by means of two
connecting links, the arms of the governor push against them. These two
arms, each constructed like a right angle and pivoted at the apex, are
arranged directly opposite each other far out in the flywheel recess. As
a weight on one angle of the arm presses outward by centrifugal force
against a spring, the other angle presses inward against the connecting
link mentioned above. The turning of the lower set of inclined planes
against the fixed set above raises the upper ring and the fork resting
on it. The upward movement of this fork, which is a continuation of an
arm pivoted to a bracket midway between the crankshaft and the slide
carrying the exhaust valve stop, causes the other end of the arm to
drop, pulling the slide down with it. In this manner the closing of the
exhaust valve is blocked, preventing the intake of the next charge, and
therefore the engine misses one or more explosions until it slows to its
normal speed.

A starting shaft is mounted above the engine casting by a cast-iron
bracket on either end. The front end of the shaft has a bevel gear which
is held by a coil spring behind the front