Motor-Car Principles: The Gasoline Automobile is a non-fiction book written by Roger B. Whitman and first published in 1917. The book is a comprehensive guide to the principles of gasoline-powered automobiles, and covers a wide range of topics related to their design, operation, and maintenance. The book begins with an overview of the basic principles of the internal combustion engine, including the various components that make up the engine and the processes by which they work together to convert fuel into mechanical energy. It then goes on to discuss the various types of gasoline engines and their different characteristics, as well as the principles of fuel delivery and combustion. Whitman also provides detailed explanations of the various systems and components that make up a modern automobile, including the transmission, brakes, suspension, and electrical systems. He covers everything from the design and operation of the engine, to the principles of steering and handling, to the principles of fuel efficiency and emissions control. Throughout the book, Whitman emphasizes the importance of proper maintenance and repair of automobiles, and provides detailed instructions for performing a wide range of maintenance tasks, from basic tune-ups to more complex repairs. He also includes a number of helpful tips and tricks for improving the performance and reliability of gasoline-powered automobiles. "Motor-Car Principles: The Gasoline Automobile" is a valuable resource for anyone interested in the principles and mechanics of gasoline-powered automobiles. Whether you are a professional mechanic, a car enthusiast, or simply someone who wants to better understand how your car works, this book provides a wealth of detailed and useful information.