What principle did Otto Schulze utilize for his 1902 mechanical speedometer invention?
Answer
The eddy current principle interacting with a rotating permanent magnet
The mechanical speedometer developed by Otto Schulze relied on a rotating permanent magnet connected to the car output shaft, usually through a flexible cable. As this magnet spun, it generated eddy currents within a nearby speed-cup assembly. These currents acted upon the assembly, causing it to move and displace a needle on the dashboard. This design transformed the rotational speed of the vehicle components into a measurable, dynamic reading of velocity, providing a reliable alternative to the subjective estimation methods previously used by drivers.
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