thread340-443599 I have one magn

[erdep]

thread340-443599

I have one magnet as your figure, it is at home since the twenties, I guess.

Do you know of what machine it was part?

Thank you.

 

[EdStainless]

Most likely a motor or a magneto (generator/alternator) so some sort.
Often there would be inner and outer ones stacked, and then two or three pair in a row in order to get enough field.

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P.E. Metallurgy, Plymouth Tube