Notes on, and Drawings of, a Four-cylindc Petrol Engine.
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We commented, in our issue of the 28th May last, on an up-to-date book on " Machine Design, Construction, and Drawing " by Henry J. Spooner, the able and energetic Principal of the Regent Street Polytechnic School. That book has now been supplemented by a collection of" Notes on, and Drawings of, a four-cylinder Petrol Engine," by the same author, and this is published by Messrs. Longmans, Green and Company, of 39, Paternoster Row, London, at the low price of two shillings. This book is a long way in advance of any similar work that has come under our
notice; the c:xampies are not component parts of machines that were obsolete fifteen or twenty years ago, but are modern instances such as are likely to interest the engineering student. We reproduce one of the diagrams herewith, and it will be seen to consist of many of the vital details of an internalcombustion motor, each fully " dimensioned "; further, the dimensions are in that clear bold style which is always appreciated by the men in the shops. Another specimen diagram may be found on page 321 of this issue, and it consists of a sectional arrangement of the complete engine. The functi and design of the different parts of engine are ably discussed, and m useful formulm are given which calculated to convey to the studen clear conception of the constitutior one of the latest and increasingly-pc hit forms of power generators. To help those students who are much acquainted with this branch engine work to understand the pet engine system, the author has prept: a diagrammatic sketch of the comp system, and this sketch shows el part distorted, and arranged in oi clearly to show their functions; he endeavoured, also, to explain in sin language, the elementary theory of engine's action. In dealing wit concrete example of a petrol eng from the best practice, he has given casional hints and notes upon sorn1 the points which guide the designe
After a student has mastered the ments of machine drawing, and has come fairly proficient in the draw of small details, he naturally yek for something more practical on wl to exercise his skill. With very few ceptions, all the books previously / lished fall far short of the student's quirements; most of them deal hopelessly out-of-date examples of chine design. What the young serious engineer requires is a col non of details from which he "build up" a complete machine, produce the "general arrangemel drawing. If he is to follow the ca of a draughtsman no better book be recommended than the one to wl we have referred.