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<p>By his method of grouping similar terms Runge has greatly simplified harmonic analysis. The object of this paper is still further to lessen the labour of analysing curves and more especially to facilitate the analysis of alternating current waves. The arrangement of the calculation is given in detail for three special cases, namely, for 6, 12, and 18 measured ordinates per half-period. Useful equations are also given for checking the accuracy of the results obtained. Numerical examples are given which show clearly that when higher harmonics are present a considerable number of ordinates must be measured in order to secure accuracy. The value of harmonic analysis for computing average and effecti
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<br>Subjects: physics; General Physics</div>
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