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Formulas are presented and derived, which have not been previously published, for mutual inductance of coils with parallel axes, repulsion of coils with parallel axes, and self-inductance of long cylindrical coils. These formulas apply to practically all cases of reactance coils in common use. They are very convergent and accurate, and will give results to a given degree of accuracy with a minimum amount of labor. For many engineering problems, precise accuracy is not required, and sets of curves are given from which approximate readings may be taken.
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H. B. Dwight (1919) studied this question.
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