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VI.—A Simple Form of Permanent Magnet suitable for the Separation of Weakly Magnetic Minerals
Published online by Cambridge University Press: 01 May 2009
Extract
The separation of the weakly magnetic minerals of crushed rocks, sands, etc., is best effected by using an electromagnet, which, if suitably constructed, is, for any given size, much stronger than a permanent magnet. The electromagnet exerts no attractive force when the current is shut off, and for this reason the process of separation is made easy, as the grains which have been attracted to the poles drop when the current is switched off.
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- Copyright © Cambridge University Press 1908
References
page 560 note 1 For an account of the use of the electromagnet in this way see “The use of the Electromagnet in Petrography,” Science Progress, No. 5, July, 1907.