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Rocker Arms<br />
set of matte-black vertical connecting rods<br />
A .transfer the oscillatory motions of the cams associated<br />
with the cylinder gears to a set of rocker arms. The<br />
arms are shaped concave upwards with a radius of curvature<br />
the same as the length of the amplitude bars that<br />
ride on them. As the crank is turned, the motion of the<br />
ends of the rockers is fascinating to watch (see the pictures<br />
on the left of the following spread): each individual<br />
rocker arm seesaws up-and-down in a continuous nearsinusoidal<br />
motion, at a frequency determined by its corresponding<br />
cylinder gear. And at the same time, when<br />
viewed from the side of the machine, the ends of the<br />
rocker arms show a mesmerizing collective motion: the<br />
ends are discretized samples of a sinusoid with frequency<br />
determined by the total number of crank turns.<br />
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