With directions for testing and a discussion of the theory of electrical apparatus. Second Edition, greatly enlarged. Assisted by C. A. Pierce. Illustrated. 6 x 9, cloth, 373 pp Net, $2.00

A practical treatise for beginners especially engineering students. 79 illustrations. 12mo., cloth, 330 pp Net, $1.50

A Manual for Amateurs and Young Students of Electro-Metallurgy. Fifth Edition, enlarged. 61 Illustrations. 12mo., cloth, 208 pp $1.20

A handbook of practical instruction on the manufacture and adaptation of the magneto to the needs of the motorist. Second Edition, enlarged. 52 illustrations. 12mo., cloth, 118 pp Net, $1.00

16 illustrations. 16mo., cloth. 100pp. (Installation Manuals Series) Net, 0.75

Their design, construction and application. 600 illustrations and plates. 120 tables, 6 x 9, cloth, 848 pp Net, $9.00

Experiments upon arcs between different electrodes in various environments and their explanation. 58 illustrations. 5 x 7, cloth, 203 pp Net, $2.00

94 illustrations and folding plates, 6 x 9, cloth, 233 pp Net, $3.50

COMSTOCK, D. F., and TROLAND, L. T. The Nature of Matter and Electricity.