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Magnetic
wheel
A light wheel
on friction rollers, set with slips of iron at an angle around its
periphery. N, N are two magnets, which, attracting the rim of the
wheel, will render one side lighter and the other heavier, causing it
to revolve ad infinitum: or, to render it more powerful, let the steel
rims be magnetized, and fixed on the wheel with their north poles
toward its center.
 Let two more
magnets be added, as shown by the unshaded lines; let
these two, S, S, be placed with their south poles nearest the rim of
the wheel, and the other two, N, N, with their north poles in that
position. Now, as similar poles repel and opposite poles attract, the
wheel will be driven round by attraction and repulsion acting
conjointly on four points of its circumference. B, B are blocks of wood
to keep off the attraction of the magnets from that part of the wheel
which has passed them. No substance yet found that interrupts the
magnetic field.
(Subsection 964, from p.387) 
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