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Inductance is a central concept in the basic education of electrical and electronic engineering, yet the practical problem of making inductors with prescribed values is rarely taught. This paper discussed the design of air-cored inductors having the economical Brooks Inductor geometry. It introduces a manufacturing method based on scaling rules that can be readily implemented in the teaching environment.

An inverted pendulum can be balanced using an oscillating system which provides stability. One such system involves a magnet supported by an ac magnetic field. More recent designs of this oscillating system uses both ac and dc magnetic fields to support the magnet. The floating magnet can be regarded as a short dipole, with the ac coil providing a vertical oscillating field. The geometry and symmetrical filamentry of the turns in an optimum ac coil are presented.

Describes an approach to the production of equipotentials of systems of point charges that offers a choice between the equipotentials of point charges and parallel line charges. Initial attempts to display the electric field; Symbol density; Shape of field maps.