A New Magnetomotive Force Gauge and Magnetic Field Indicator

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Abstract
A new gauge and method of measurement are described, whereby the distribution of magnetic potential may be determined along the ferromagnetic core of a telephone relay, or similar electromagnetic device, while it is mounted in operating position, without disassembly, special search coils, or even change in adjustment. The gauge is portable, compact, and sensitive. A glass-enclosed, magnetically operated reed switch, which is used because of its small size, high sensitivity, and magnetic structural features, is held electrically closed by the magnetomotive force which it is desired to measure. This magnetomotive force is opposed by a countermagnetomotive force supplied by a winding on the switch. The current in the winding which opens the switch is the measure of the magnetomotive force. The necessary control circuits and the procedures for their use are described for both manual and automatic operation. The device and method are applicable to the study of permanent magnets as well as electromagnetic structures. The coercive force of the core of a relay may be determined in a nondestructive manner.

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