The potential due to a uniformly magnetized sphere of radius a for an external point at a distance r from the centre is V =:I ra 3 I cos 0/r 22 , (23) 0 being the inclination of r to the magnetic axis.
The metal, having first been uniformly tempered glasshard, should be annealed in steam at loo° C. for twenty or thirty hours; it should then be magnetized to saturation, and finally aged by a second immersion in steam for about five hours.
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