CONTENTS OF VOLUME II. 



THE STEAM-ENGINE— third lecture , 451 



Methods of Connecting the Piston-Rod and Beam in the Double-Acting Engine. — Rack and Sector. 

 —Parallel Motion.— Connexion of Piston-Rod and Beam.— Connecting Rod and Crank.— Fly- 

 wheel.— Throttle-Valve.— Governor.— Construction and Operation of the Double-Acting Engine. 

 —Eccentric— Cocks and Valves.— Single- Clack Valves.— Double-Clack Valves.— Conical Valves. 

 —Slide Valves.— Murray's Slides. — The D Valves.— Seaward's Slides.— Single Cock.— Two-way 

 Cock. — Four-way Cock. — Pistons. — Common hemp-packed Piston. — Woolf's Piston. — Metallic 

 Pistons.— Cartwright's Engine.— Cartwright's Piston.— Barton's Piston. 



THE STEAM-ENGINE— fourth lecture 491 



Analysis of Coal. — Process of Combustion. — Heat evolved in it. — Form and Structure of Boiler. — 

 Wagon-Boiler. — Furnace.— Method of Feeding it.— Combustion of Gas in Flues.— Williams's 

 Patent for Method of Consuming unburned Gases. — Construction of Grate and Ash-Pit. — Magni- 

 tude of Heating Surface of Boiler. — Steam-Space and Water-Space in Boiler. — Position of Flues. 

 — Method of Feeding Boiler. — Method of Indicating the Level of Water in the Boiler. — Lever 

 Gauges.— Self- Regulating Feeders. — Steam-Gauge. — Barometer- Gauge. — Watt's Invention of the 

 Indicator. — Counter. — Safety-Valve. — Fusible Plugs. — Self-Regulating Damper. — Brunton's Self- 

 Regulating Furnace. — Gross and Useful Effect of an Engine. — Power and Duty of Engines. — 

 Horse-Power of Steam-Engines. — Table exhibiting the Mechanical Power of Water converted 

 into Steam at various Pressures.— Evaporation proportional to Horse-Power.— Sources of Loss of 

 Power. — Absence of good Practical Rules for Power. — Common Rules followed by Engine-Makers. 

 —Duty distinguished from Power.— Duty of Boilers. — Proportion of Stroke to Diameter of Cylin- 

 der. — Duty of Engines. — Cornish System of Inspection. — Table showing the Improvement of Cor- 

 nish Engines. — Beneficial Effects of Cornish Inspection. — Successive Improvements on which the 

 increased Duty of Engines depends, traced by John Taylor in his " Records of Mining." 



THE STEAM-ENGINE— fifth lecture 525 



Railways. — Effects of Railway Transport. — History of the Locomotive Engine. — Construction of 

 Locomotive Engine by Blinkinsop. — Messrs. Chapman's Contrivance. — Walking Engine. — Mr. 

 Stephenson's Engines at Killingworth. — Liverpool and Manchester Railway. — Experimental Trial 

 of the " Rocket," " Sanspareil," and "Novelty." — Method of Subdividing the Flue into Tubes. — 

 Progressive Improvement of Locomotive Engines. — Adoption of Brass Tubes. — Detailed Descrip- 

 tion of the most Improved Locomotive Engines. — Power of Locomotive Engines. — Position of the 

 Eccentrics. — Pressure of Steam in the Boiler. — Dr. Lardner's Experiments in 1838. — Resistance 

 to Railway Trains.— Dr. Lardner's Experiments on the Great-Western Railway.— Experiments 

 on Resistance. — Restrictions on Gradients. — Compensating Effect of Gradients. — Experiment 

 with the " Hecla." — Disposition of Gradients should be Uniform. — Methods of surmounting Steep 

 Inclinations. 



