[Healeys] Speedometer gearing

[Bob Spidell]

Vewy intewesting: http://en.wikipedia.org/wiki/Eddy_current

Makes sense, and explains how a permanent magnet can induce an Al drag cup to turn.

Another 50 years or so and I'll have Smith's speedometers figured out completely.

Bob



On 5/16/2011 11:18 PM, Josef.Eckert at t-systems.com wrote:
> Bill,
> No magnetic component in the alloy. What forces the aluminium disc to turn is
> the so called electro-magnetical eddy current prinziple (sorry, hope this is
> the right expression in English language).
>
> Josef Eckert
> Konigswinter/Germany


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Bob Spidell           San Jose, CA            bspidell at comcast.net

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