xxviii LIST OF ILLUSTRATIONS ON WOOD. 



FIG. PAGE 



280. Pressure-gauge with conical tube .... 404 



281. Metallic pressure-gauge . . . 405 



282. Boiler, with lateral heaters, Farcot's system 406 



283. Marine tubular boiler, with return flame 407 



284. Sectional elevation of Shand and Mason's inclined water-tube boiler 



for fire-engines . ...*.--. . 408 



285. Arrangement of tubes ..." 408 



286. Horizontal section "... 408 



287. Circulating boiler. Belleville's system .... . 410 



288. Spring piston 412 



289. Swedish piston 412 



290. Longitudinal section of a cylinder 414 



291. Phases of the reciprocating motion of the piston and slide-valve -. . 415 



292. Distribution of the steam : D valve 415 



293. Clapeyron's expansion system : slide-valve with laps 417 



294. Section of the two cylinders in WoolfPs expansion system .... 418 



295. Woolff's system of distribution and expansion : the two cylinders . . 419 



296. Principle of transmission in beam-engines . 421 



297. Watt's jointed parallelogram ..-:..... 421 



298. Watt's centrifugal regulator or governor ...*... 423 



299. Watt's beam-engine ... . 426 



300. Vertical >team-engine . . . ... . . . 427 



301. Horizontal steam-engine ........... 428 



302. Oscillating steam-engine - 429 



303. Behrens's rotatory engine 431 



304. Eotatory ."engine : phases of a complete motion of rotation .... 432 



305. Savery's steam-engine 439 



306. Framework of screw behind a ship 451 



307. Smith's first model screws : single screw with complete turn ; double 



screw with half turn 453 



308. Screws with two and four wings 453 



309. Tubular boiler, with return flame, of the Isly : section 455 



310. Marine tubular boiler, with return flame : section . 455 



311. Side-lever engine of the Sphynx 458 



312. Combined engines of the Fried-land . . . . . . . . . . . . 459 



313. The Rocket 465 



314. Locomotive: longitudinal section ..... . . . 467 



315. Locomotive : transverse section across the fire-box 468 



316. Locomotive : transverse section across the smoke-box 468 



317. Express engine : Grampton's type 471 



318. Goods engine for slow trains : Engerth's type 472 



319. Goods engine on the Northern Railway of France, with twelve coupled 



wheels and two cylinders . 472 



320. Compressed-air locomotive used at the St. Gothard Tunnel works . . 474 



321. Mechanism for regulating the pressure 475 



322. Larmanjat's road-engine 479 



323. Thomson's road-engine 480 



324. Aveling and Porter's traction-engine 482 



