About the book: 1957 / This book is not a textbook. There is no detailed description of the design of different engines. Here we only talk about the principles on which the operation of engines is based, what connects different types of engines, and what distinguishes them. This book talks about “old” engines, which, having played their role, have already left or are leaving the stage, about “young” engines and about “baby” engines, that is, about those who have only recently won the right to life, and about those who are going through their “childhood”, preparing to take a strong place in the technology of tomorrow. For many of you, this will be the first book about engines. And the author would like to think that among the readers there will be many who will be seriously and for a long time interested in engine technology, who, following this book, will read special technical books and deepen their knowledge on them.