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This paper gives a classification of existing inductance formulas for the general cases indicated, and discusses the possiblity of additional formulas of each class. A number of new formulas are developed which can be used to advantage for certain cases. Still other formulas could be obtained, but on account of complexity or poor convergence they are not likely to be useful. It is shown by numerical examples that the inductance in any given case can be calculated by more than one formula and to a degree or precision far beyond practical requirements. CONTENTS Page

Methods for the derivation and expansion of formulas for the mutual inductance of coaxial circles and for the inductance of single-layer solenoids