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A speedometer is a vehicle instrument that measures
the instantaneous speed.
Traditional automotive speedometers are driven by
a flexible, sleeved cable that is rotated by a set
of small gears in the tail shaft of a transmission.
The early Volkswagen Beetle and many motorcycles,
however, use a cable driven from a front wheel.
The most common form of speedometer relies on the
interaction of a small permanent magnet affixed
to the rotating cable with a small aluminum cup
affixed to the shaft of the pointer. As the magnet
rotates near the cup, the changing magnetic field
produces eddy currents in the cup, which themselves
produce another magnetic field. The effect is that
the magnet 'drags' the cup and thus the speedometer
pointer in the direction of its rotation with no
mechanical connection between them... |
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