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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