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<p>The authors first give a complete proof of Maxwell's formula for the mutual inductance between concentric coaxial solenoids of equal length. They then deduce Roiti's formula very simply by means of Maxwell's equations. The formulae of Gray, Searle, Himstedt, and Cohen are discussed. Cohen's formula is very laborious to evaluate, but it is useful in the special cases where the other formulae converge slowly, and when it is necessary to test their accuracy. The authors point out that Russell has made an algebraical slip in his elliptic integral formula, having written /b k//sup 2/ for /b k//sup 4/ in the elementary formula utilised in the last line of his proof. Correcting this slip, they find that his result is identical with Cohen's. They st
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<br>Subjects: electromagnetic induction; Electrical instruments and techniques</div>
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