Empirical analysis of complex electric waves

N. E. Bonn: The last method described in Mr. Horton's paper and the one which he evidently prefers, involves the use of a sine-wave oscillator of variable frequency. Now a sine-wave oscillator, especially one whose frequency may be varied over a large range without disturbing the wave form, would make a very valuable adjunct to many a laboratory. Will Mr. Horton please state what method he uses to make certain of the purity of the wave form?

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[2]  R. L. Wegel,et al.  An Electrical Frequency Analyzer , 1924 .

[3]  M. I. Pupin,et al.  Resonance Analysis of Alternating and Polyphase Currents , 1894, Transactions of the American Institute of Electrical Engineers.