Alternate Current Measurement . Fig. 4. of its long sides as an axis (shown at 0), the opposite side moving inthe arc-shaped air gap between the poles. A pointer OP is attached to thecoil and reads on a suitable scale PS. The magnetic joints, indicated atJ, needed for constructional purposes, are made as good as possible bybuilding up successive stampings, so as to overlap at the joints. Theresistance of the magnetising coil (consisting of two windings, one on eachlimb) is reduced by using as much metal in the coil as the available windingspace allows. Such constructional features ensure two d
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Alternate Current Measurement . Fig. 4. of its long sides as an axis (shown at 0), the opposite side moving inthe arc-shaped air gap between the poles. A pointer OP is attached to thecoil and reads on a suitable scale PS. The magnetic joints, indicated atJ, needed for constructional purposes, are made as good as possible bybuilding up successive stampings, so as to overlap at the joints. Theresistance of the magnetising coil (consisting of two windings, one on eachlimb) is reduced by using as much metal in the coil as the available windingspace allows. Such constructional features ensure two desirable results.The ratio of the resistance of the coil to its impedance is made small, andthe ratio of the magnetic leakage to the total magnetic flux is diminished.as much as possible. The latter ratio cannot be assumed to be quite constantfor different magnetising currents, so that, unless it is a small fraction, the 328 Dr. W. E. Sumpner. [Jan. 21 p flux density at a particular part of the air gap may not always be suffici
