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เนื้อหาย่อ : DURING the twelve years that have elapsed since this book was written, the progress in the field of internal-combustion gines has continued, possibly even with an accelerated The design and construction of existing engines have been improved and changed; new and better designs have appeared on rket, with a very conspicuous trend toward higher and greater power output. Deeper and more correct understanding has been attained in respect to thermo- and hydrodynamical processes and also in respect to the strength and wear of various machine parts. This is justification for a new, entirely revised edition of the book. The author has tried to improve the book for class use by taking into account not only the suggestions which he has received from instruetors who have used his book in their classes but also his own teaching experience. As might be expected, the suggestions were of a greatly differing nature. Some wanted more material in respect to theory; others in respect to recent arch; and several asked for strengthening the cl devoted to design. At first the author was afraid that complying with all these suggestions would make the book too bulky as a text for an undergraduate course. However, since the book, even in the first edition, contained slightly more material than could be covered satisfactorily in a one-semester course, the author decided to include all material which seemed to be of interest from various points of view but to present it in such a way that certain chapters could be omitted without harm to the fundamental exposition. This gives a valuable fexibility to the book as a class text: it may be used in undergraduate courses, whether short or long, by covering only those chapters which the individual instructor considers most essential; the rest of the chapters may be used in a second, advanced course. The book may also be used as a text in a course consisting of classes in theory and in a design laboratory. Finally, the book has enough material for two consecutive courses, the first of a theoretical nature, followed