Offering this nice technical book titled OPERATION OF ELECTRICAL MACHINERY TESTS by E.F. BRACKEN B.S. and LAWRENCE S. BOURST, Published by International Textbook Co, PA, 1937, No. 157C. Black leather / leatherette semi hardboards with raised lettering on front and gold gilt lettering on spine. Very clean, no spine cracks, fraying, very minor corner and spine edge rubs, very nice overall. Page edges are tipped in blue. Green marbled end papers; hinges are secure, spine is straight. All text pages are clean and crisp, no scribbling, or tears. Book measures 7 1/2 x 5 inches. Very handsome technical book, with plenty of information and pictures on electric electric motors, direct and alternating current, generators, parallel operation, alternators, voltage regulators, transformers, converters, various test proceedures etc. With plenty of diagrams charts, illustrations, and text. A very nice technical book!