Product Review

International Electrical Congress ofT urin, but the time diagram or polar coordinate system has been explained and discussed inC hapter VII, since the crank diagram is somewhat inferior to the polar diagram, as it is limited to sine waves, and the time diagram will thus remain in use when dealing with general waves and their graphic reduction. CHARLES P. STEINMETZ. SCHENECTADY, N. Y., May,
(Typographical errors above are due to OCR software and don't occur in the book.)

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