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<p>This apparatus is H-shaped with test coils ST spanning the free ends of the H and a magnetising coil M wound on the cross-piece. D and D' are also test coils. SDD'T have the same number of turns and are connected in series and in such a manner that the integrated e.m.f.'s induced in S and D' when a magnetising current is reversed in M are in the same direction but in opposition to those simultaneously induced in D and T. The permeameter is initially adjusted so that when the coils S and T encircle air the differential effect of the coils D and D' is zero. In use, S encircles a standard bar bridging the gap on the left and T the test-bar bridging the gap on the right. In the cross-
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<br>Subjects: magnetism; measurements and use of instruments/ B8000 Power systems and applications</div>
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