International Library of Technology · Scranton, International Textbook Co. · leaf 165
tangent galva-nometer, with an adjustable control-ling magnet m. If this controllingmagnet be so placed that its ^ polecorresponds in direction with the Npole of the magnet of the instrument,its field will be added to the earthsfield, so that a given current will givea smaller deflection than if… … 2467. Controlling magnets are used on many forms ofgalvanometers; there is a difficulty, known as drift, whichattends their use, especially when usedto make the galvanometer very sensi-tive. This difficulty is due to the factthat the direction of the earths field iscontinually changing slightly,…
Electrical engineering
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