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This pocket-sized book provides designers and troubleshooters of a-c motor control systems with a handy reference to use in the shop or in the field. It explains both common and unusual circuits and diagram conventions. In addition to illustrating starting switches and other basics, the book contains diagrams for jogging and plug reversal, starting under varying speed and winding combinations, and controls using indicating lamps. Also included are a glossary, a table of device function numbers, and a list of NEMA enclosure designations. Thirty-three diagrams are included in all.