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Cool
and funny PC-mod.
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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