Chapter V.--The Determination of Optical Constants. Chapter

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_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'."

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ENGINEERING WORKSHOPS, MACHINES AND PROCESSES. By F. ZUR NEDDEN. Translated by JOHN A. DAVENPORT. With an Introduction by SIR A. B. W. KENNEDY, LL.D., F.R.S., M.Inst.C.E., M.Inst.M.E. Plates. Demy 8vo. 6_s._ net.

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THE INTERNAL COMBUSTION ENGINE: Being a Text-Book on Gas, Oil, and Petrol Engines, for the use of Students and Engineers. By H. E. WIMPERIS, M.A., Assoc.M. Inst.C.E., Assoc.M.Inst.E.E. Illustrated. Crown 8vo. 6_s._ net.

CONTENTS:--Introductory. Section I.--THEORY: Thermodynamic Cycles. Combustion and Explosion. Thermodynamics. Section II.--GAS ENGINES AND GAS PRODUCERS: The Gas Engine. The Gas Producer. Blast Furnace and Coke-Oven Gases. Section III.--OIL AND PETROL ENGINES: The Oil and Petrol Engine. Petrol Engine Efficiency and Rating. Index.

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CONTENTS: Unit of Power. Natural Forces. Early Types of Engine. The Watt Engine. The Use of Steam in Multiple Cylinder or Compound Engines. Valve Gears. Double or Compound Slide Valves. Releasing Valve Gear. Exhaust Valves and Valve Driving Gear. The Governor. Electrical Regulation. Condensers. The Steam Turbine. Design of Details. Examples of Various Types. Feed and Steam Heating. Hints to Users. Appendix. Tables and Formulæ. Index.

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CONTENTS: Chapter I.--APPLIED MECHANICS. Chapter II.--APPLICATIONS. Chapter III.--BEAMS. Chapter IV.--TORSION.