(under subclass 253) Subject matter wherein the composite alternating flux and the magnetic field tested produce a cyclically alternating magnetic flux in the core which will produce peak flux values each half cyclic of the alternating flux although the peaks are not symmetrical half waves of flux, and wherein electrical circuitry connected between the electrical sensing coil and the apparatus to indicate the sensing of the field determines the (1) peak value, (2) the difference in the peak value, or (3) the average value of the voltage induced in the sensing coil caused by the alternate half cycles of the flux in the core.
