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<p>The author finds a new formula for the mutual inductance between a circle and a coaxial helix. J. V. Jones gives two formulae in terms of complete and incomplete elliptic integrals, but making numerical calculations by them is extremely tedious and laborious. The new formula is first deduced from considerations in connection with the potential of a uniformly magnetised circular disc. It is also deduced from a very general formula given by A. Gray [/b Absolute Measurements/, Vol. II., Part I., p. 274]. The first terms of the formula can also be at once deduced from Searle and Airey's formula. The effect of the
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<br>Subjects: electromagnetic induction; measurements and use of instruments; Electrical instruments and techniques</div>
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