*RUHMER, ERNST. Wireless Telephony in Theory and Practice.* Translated from the German by James Erskine-Murray. Illustrated. 5vo., cloth, 224 pp Net, $3.50
*RUSSELL, A. The Theory of Electric Cables and Networks.* 71 Illustrations. 8vo., cloth, 275 pp Net, $3.00
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*SEWELL, T The Construction of Dynamos (Alternating and Direct Current).* A Text-book for students, engineering contractors, and electricians-in-charge. Illustrated. 8vo., cloth, 316 pp $3.00
*SHELDON, S., and HAUSMANN, E Dynamo-Electric Machinery: Its Construction, Design, and Operation.
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*SLOANE, T. O’CONOR. Elementary Electrical Calculations.* A Manual of Simple Engineering Mathematics, covering the whole field of Direct Current Calculations, the basis of Alternating Current Mathematics, Networks, and typical cases of Circuits, with Appendices on special subjects. 8vo., cloth. Illustrated. 304 pp Net, $2.00
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