Death of his younger Son 311 Extracts from his Letters 312 Character of Watt by Lord Brougham 313 Extract from Sir Walter Scott's "Monastery" on the Character of Watt 314 Sketch of the Life of Watt from the "Scotsman" by Lord Jeffrey 315 Occupation of his old Age 318 His Invention of Machine for copying Sculpture 318 His last Days 318 Monuments to his Memory 319 Inscription by Lord Brougham on the Pedestal of the Monument in Westminster Abbey 320 CHAP. XI. LOCOMOTIVE ENGINES ON RAILWAYS. Page High-pressure Engines 322 One of the earliest Forms of the Steam Engine 322 Description of Leupold's Engine 323 Non-condensing Engine of Messrs. Trevethick and Vivian 324 Construction of a Machine for moving Carriages on Railroads 328 Effects of Railway Transport 329 Moral and political Consequences of 334 History of the Locomotive Engine 337 Construction of Locomotive Engine by Blinkensop 337 Messrs. Chapman's Contrivance 337 Walking Engine 337 Mr. Stephenson's Engines at Killingworth 339 Liverpool and Manchester Railway 342 The Directors offer a Prize for the best Locomotive Engine 344 Experimental Trial 344 The "Rocket," "Sanspareil," and "Novelty" 344 Admirable Arrangement in the Rocket 345 Description of the "Sanspareil" 347 Description of the "Novelty" 349 The Superiority of the "Rocket" 350 Method of subdividing the Flue into Tubes 353 Progressive Improvement of Locomotive Engines 354 Dr. Lardner's Experiments in 1832 357 Adoption of Brass Tubes 360 Great Expense of Locomotive Power 361 Mr. Booth's Report 362 Detailed Description of the most improved Locomotive Engines 365 Substitution of Brass for Copper Tubes ascribed to Mr. Dixon 370 Power of Locomotive Engines 379 Position of the Eccentrics 379 Pressure of Steam in the Boiler 401 Dr. Lardner's Experiments in 1838 406 Resistance to Railway Trains 407