Abstract
Most acoustical measuring and sound reproducing instruments at the present time make use of magnetic circuits in which the concentrated flux in an air gap is utilized. To design efficient magnetic circuits it is necessary to know the magnitude of the leakage flux. Mapping of leakage flux is made by measuring the voltage generated by a vibrating wire as it is moved throughout a magnetic field. By amplifying the generated voltage it is possible to measure low intensity magnetic fields in very small areas. The method is remarkably accurate in measuring a nonuniform magnetic field.
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