
302 Handbook of Magnetic Measurements
Hopkinson over a century ago (Hopkinson 1885). In per-
meameter type B, the magnetizing coil is wound on the
yoke. Near the specimen there are coil sensors, includ-
ing Rogowski–Chattock potentiometer. The permeam-
eters proposed by Fahy (1918) or Neumann (1939) are
examples of such devices.
In previous century, a large number of various perme-
ameters were proposed (e.g., by Iliivici, Babbit, Sanford,
Carr, Burrows, Ewing, Fischer, and more). Recently, for
strip samples, the so-called single strip tester is used (it
resembles the permeameter type A). This type of device
that can be easy adapted for ot ...