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2 free books by Dionysius Lardner, free to read online. Chapter 1 of any book is free, no account needed.
The Steam Engine Explained and Illustrated (Seventh Edition) With an Account of Its Invention and Progressive Improvement, and Its Application to Navigation and Railways; Including Also a Memoir of Watt
Dionysius Lardner
The Steam Engine Familiarly Explained and Illustrated With an historical sketch of its invention and progressive improvement; Its Applications to Navigation and Railways; With Plain Axioms for Railway Speculators