"Automobile Engines."

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“Automobile Engines.” By Arthur W. Judge.

The above-mentioned book, published by Messrs. Chapman & Hall, Ltd., at 4 /-, is the first of a series intended to present, in a simple and non-technical manner, the elementary aspects of each branch of the subject, and is prepared for the use of motor owners, engineers, students and others. •

The subject matter of Volume I. has been selected carefully, being presented by the author in a clear and precise manner, which is easy to read, in addition to being informative. While the majority of the illustrations are excellent, some of the line drawings lose part of their value by the smallness of reproduction. Chapter I. deals with ” The Combustion Process in Theory and Practice,” and the reader has the opportunity of studying such matters as fuels, the elements of combustion, detonation, cylinder pressures, horse power and supercharging. Chapter II. is devoted to descriptions of the various components of typical petrol engines, and has the added virtue of being

up to date. Various types of automobile are discussed in Chapter III., including airmotor cycle power units, engines with sleeve and forms of valve gear, while balancing devices and receive due attention. Chapters IV. and deal with lubrication and cooling respectively, these being treated in considerable detail. The two chapters on “Testing and Tuning” appear to be abridged, but serve to whet the appetite of the for the other volumes, which, we understand, in course of preparation.

Four-Wheel Driven Racer.

It is well known that for several years Miller, the motor constructor and racer, has specialised the production of racing cars which have been sold amateur and professional speedmen ; but we learn his latest experiments lie in the direction of a driven racer, which, it is hoped, will make appearance on the American tracks this season.