This work presents the history, principles, and practical use of link motion and expansion gears, illustrated by hundreds of plates and diagrams that illuminate real-world applications.

The text combines historical narrative with technical detail, tracing the invention, development, and widespread adoption of valve-gear systems. It explains how the link motion works, why it matters for reversing and expanding steam, and how engineers relied on careful design and tested practice to achieve reliable performance.

Clear explanations of how steam-working valves and link motions operate
Historical context showing the evolution of valve gear from 1775 to 1870
Hundreds of illustrations and plates illustrating gears, cams, levers, and timing
Practical discussions of proportions, lead, lap, and expansion in steam engines

Ideal for readers interested in the history of engineering, marine and locomotive power, and the practical craft of valve-gear design.

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