James D. Roots presents a careful look at early engine theory and practice, tracing different cycle concepts from the first explorations to the key developments of the late 19th century. The book compares classifications proposed by engineers, explains the reasoning behind them, and illuminates the practical limits of compression, ignition, and expansion in various engine types.

Clear explanations of cycle definitions and why certain engines are grouped together
Discussion of ignition timing, compression, expansion, and exhaust in historical context
Illustrations and diagrams that help visualize how different cycles operate
A historical perspective on debates among engineers about stratification, speed, and efficiency

Ideal for students and engineers seeking a foundational, era-rich understanding of gas and oil engine cycles, and for readers curious about how early concepts shaped modern engine design.

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