A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 362
The electro-magnet is applied at the bend, one pole on each arm, anddrawn towards the extremities, N, S. This is done several times on bothsides, when the bar is rendered permanently magnetic. To deprive it of itsmagnetic power, reverse the process, by applying the poles of the electro^magnet to…
Physics
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