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  1. This article appeared originally in Elektrotechnische Zeitschrift 42, p. 1331, 1921.At the request of several of our readers, and with the permission of the editors of ETZ, the paper has been translated and prepared for publication in this JOURNAL by H. B. Brooks,Bureau of Standards.

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This article appeared originally in Elektrotechnische Zeitschrift 42, p. 1331, 1921.At the request of several of our readers, and with the permission of the editors of ETZ, the paper has been translated and prepared for publication in this JOURNAL by H. B. Brooks,Bureau of Standards.

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