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TOWNSEND, FITZHUGH. Alternating Current Engineering. 32 Pp. Ilustrated ee, net, $0.75 TREVERT, E. Practical Directions for Armature and Field- -Magnet Winding. Illustrated. 12mo, cloth. .. Ca $1.50 UNDERHILL, CHAS. R. The Electro-magnet. 12mo, cloth. 150 Pp. IMustrated .. .. o.oo net, $1.50 WADE, E. J. Secondary Batteries; Their Theory, Construction, and Use. 8vo, cloth. 492 pp. Illustrated Ce net, $4.00 WALKER, FREDERICK. Practical Dynamo-building for Amateurs. How to Wind for any Quput. Illustrated. 16mo, cloth. (No. 98 Van Nostrand's Science Series. ). Ce ce . $0.50 —— SYDNEY F. Electricity in our Homes and Workshops. A ‘Practical Treatise on Auxiliary Electrical Apparatus. Illustrated. 12mo, cloth Ce $2.00 WALLING, B. T., LT.-COM., U.S. N., and MARTIN, J. Electrical Instal- lations of the U. S. Navy. 8vo, cloth. Illustrated .............. $6.00 WALMSLEY, R. M. Electricity in the Service of Man. A Popular and Practical Treatise on the Application of Electricity in Modern Life. From the German, and edited, with copious additions, by R. Wormell, and an Introduction by Prof. J Perry. With nearly 850 Illustrations. 8vo, cloth. cee Ce $4.50 WATT, ALEXANDER. The Electro- Plating and Electro- Refining of Metals: being a new edition of Alexander Watt's *“ Electro-Deposition,” revised and largely rewritten by Arnold Philip, B.Sc. With many Figures and Diagrams. Illustrated. 8vo, cloth........... net, $4.50 —— Electro-Metallurgy Practically * Treated. Fifteenth edition, consid- erably enlarged. 12mo, cloth. Ce Cee .$1.00 WEBB, H. L. A Practical Guide to the Testing c of Insulated Wires and Cables. Illustrated. 12mo, cloth. Fifth edition... .... $1.00 WEYMOUTH, F. MARTEN. Drum Armatures and Commutators. (Theory and Practice.) A complete treatise on the theory and construction of drum-winding, and of commutators for closed-coil armatures, together with a full résumé of some of the principal points involved in their design; and an exposition of armature reactions and sparking. 8vo, cloth. Illustrated ............ iii, $3.00 WILKINSON, H. D. Submarine Cable- “Laying, Repairing, and Testing. 8vo, cloth . ee .New edition in Press YOUNG, J. ELTON. Electrical Testing for Telegraph Engineers. With Appendices consisting of Tables. 8vo, cloth. Illustrated...... $4.00 A General Catalogue — 112 pages — of Works in all branches of Electrical Science furnished

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