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<p>Mathy, by introducing the Weierstrassian notation, obtaines the mutual inductance of two parallel, coaxial circles in terms of hypergeometrical series instead of the usual elliptic functions. The author examines the formula obtained, and finds that it is subject to serious limitations. In many cases its error may be as great as 10 per cent. Before using it a preliminary examination is necessary to see whether the series is uniformly converging or not. A special formula is given when the greatest distance, /b r//sub 1/, between points on the two circles is radic 2 times the shortest distance, /b r//sub 2/, between them. [This special formula and many similar ones follow at once from the second form in which%2
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<br>Subjects: inductance; Electrical instruments and techniques</div>
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