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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

T. Crook
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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.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 12 , December 1908 , pp. 560 - 561
Copyright
Copyright © Cambridge University Press 1908

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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.