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8vo, pp. viii, 132 + 5 folding charts. Original blue cloth, boards bordered with a double blind rule, front board lettered in gilt and blind, spine lettered in gilt. Some wear to extremities, particularly head of spine. Bookplate of the Library of the American Institute of Electric Engineers to pastedown, their ink stamp to title-page dated March 5 1912, ink shelfmark to foot of spine.