Steam engine, first mover in, 19. Physical effects connected with, 20. Claims to the invention of, 38. Efficacy of, as a mechanical agent, 39. First brought into operation by Savery, 50. Its inefficiency, 58. First proposed to be applied to the drainage of mines, 61. Accidental discovery of condensation by jet, 65. Further improvements by Humphrey Potter and Beighton, 67, 68. Description of Papin's engine, 71. First experiments of Watt and subsequent improvements, 73. Dr. Black's theory of latent heat, 76. Watt's method of condensation, 76. Further improvements of Watt, 77. Description of Watt's single-acting engine, 80. The cold water pump, 86. The hot water pump, 86. Erection of a specimen engine at Soho, and gradual demand for them, 89. The single-acting engine inapplicable to manufactures, 91. The double-acting engine, 92. Invention of the parallel motion, 95. Introduction of the rotatory motion, 100. The fly-wheel, 104. The governor, 105. The throttle valve, 105. The eccentric, 111. The D valve, 113. The four-way cock, 115. Methods for ascertaining the level of water in the boiler, 118. The engine made to feed its own boiler, 120. Waste of water prevented, 121. The steam gauge, 122. Barometer gauge, 123. The damper, 125. Methods proposed for preventing the waste of fuel, 128. Mr. Brunton's furnace described, 130. Mr. Oldham's modification of the self-regulating furnace, 132. Improvements by Hornblower and Woolf, 134. Description of the improvements of Mr. Cartwright, 142. High-pressure engines, 145. Leupold's engine described, 147. Construction of the first high-pressure engine by Messrs. Trevithick and Vivian, 148. First application of the steam engine to propel carriages on railroads, 151. How applied to navigation, 242. Marine engine; its form and arrangement, 243. Mr. Howard's patent engine described, 253. Mr. Hall's engine described, 248 Steam gauge, the, 122 Steam navigation, incredulity which existed respecting, 159. The limit of its present powers, 264 Steam vessels, their average speed, 265. Their average consumption of fuel, 265. Proportion of their power to their tonnage, 266. Speed of post-office packets, 268. Iron steam vessels, 269. American vessel called the "Cigar Boat," its great speed, 270 Stephenson's, Mr., description of an engine constructed by him, 164. Premium awarded to this engine by the Liverpool and Manchester Railway Directors, 170. His method of dividing the flues, 179 Stephenson and Lock, Messrs., appointed by the Directors of the Liverpool and Manchester Railroad to make reports on the merits of various railroads, 167 Sun and planet wheels, 101 T. Thermometer, description of, 24 Throttle valve, use of, 104