ENTROPY: Or, Thermodynamics from an Engineer's Standpoint, and the Reversibility of Thermodynamics. By James Swinburne, M.Inst.C.E., M.I.E.E., etc. Illustrated with Diagrams. 4s. 6d. net.

ELECTRICAL ENGINEERING

ELECTRICITY. By H. M. Hobart, B.Sc., M.Inst. C.E., etc. A Text-Book designed in particular for Engineering Students. 208 pages + xix. 43 Tables and 115 Illustrations. Demy 8vo. 6s. net.

Contents:—The "Generation" and Conduction of Electricity. Copper, Aluminium, and other Conducting Materials. Energy. The Kelvin. Electricity. Continuous Electricity and Ohm's Law. The Magnetic Field. Conductors Moving in a Magnetic Field. Alternating Electricity. Inductance. The Magnetic Circuit. Insulating Materials.

The Engineer.—"A rapid glance at the illustrations contained in this book is sufficient to show that it differs very materially from most others having the same title. Indeed, it may be said that the volume possesses that desirable but unusual feature—originality. A chapter on the magnetic field contains information which the student will find well worth acquiring, and the same applies to that section of the book which deals with conductors moving in a magnetic field. The alternating current section is also good, and in a number of places it possesses the merit of originality. The book, as we have already intimated, is written on practical lines, and it is a decided improvement on most books we have seen having for their title the word 'Electricity'."

CONTINUOUS CURRENT ENGINEERING. By Alfred Hay, D.Sc., M.I.E.E. About 330 pages. Fully Illustrated. Demy 8vo. 5s. net.

A standard text-book for the practical student, giving a simple account of the component parts of a continuous current lighting and power plant, dynamos, motors, secondary cells, measuring instruments, etc.

DIRECT AND ALTERNATING CURRENT TESTING. By Frederick Bedell, Ph.D., Professor of Applied Electricity in Cornell University, and Clarence A. Pierce, Ph.D. 8s. net.

Contents:—Direct Current Generators. Direct Current Motors. Synchronous Alternators. Single-Phase Currents. Transformers. Polyphase Currents. Phase Changers. Potential Regulators, etc.

THE THEORY OF ELECTRIC CABLES AND NETWORKS. By Alexander Russell, M.A., D.Sc. Demy 8vo. 8s. net.