1. Pieces which have an axis of symmetry always have two equipotential surfaces in the form of planes. Pieces of a complicated shape may have curvilinear equipotential surfaces. The “model” method is therefore more easily adapted for symmetrical bodies.
2. By peripheral density of eddy currents we mean the total current in a 1-cm width.
3. Inductivity is determined by the ratio of the magnetic flux section to the medial length of magnetic force lines.
4. With correct design of the bushing this ratio is 0.8–0.85.