Excerpt from Determination of the Magnetic Induction in Sheet Steel
This permeameter (fig. 2) operates on a somewhat di¿erent prin ciple from that of the Burrows apparatus and requires but a single specimen. The magnetizing force is applied by means of an electro magnet, acro... ss the poles of which the specimen is clamped. A uni formly wound'test coil extends over the whole length of the speci men. A ballistic galvanometer connected to this test coil indicates the induction in the specimen when the magnetizing current is re versed.
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