controlling magnet

controlling magnet

[kən′trōl· iŋ ‚mag·nət]
(engineering)
An auxiliary magnet used with a galvanometer to cancel the effect of the earth's magnetic field.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Two standard style bar magnets are available: Bantam Magnets and Magna-Bars, In automation processes, compact Bantam Magnets are used as holding magnets or retaining and controlling magnets. The complete enclosure of the magnetic element prevents loss of magnetic strength from contact with surrounding equipment which would occur with the use of unprotected magnetic castings.