CONTENTS. 



XVll 



Mechanical power of a stream ; 321. Breast wheel ; 

 Second wheel; Oblique wheels and windmills ; 322, 

 SIS. Smoke jack; Kite; Parent's mill; Seamanship ; 

 Side wind; S'ii. Vovva and arrangement of a vessel; 

 325. Stability of a ship; 326. 



Lecture xxviii. On hydraulic ma- 

 chines; 327. 



Machines for raising water; Noria; Bucket wheel ; 

 Throwing wheel ; Rope pump : 32r. Venturi's drain ; 

 Spiral pipes; Screw of Archimedes; .'528. Water 

 screw ; Wirtz's spiral pump ; 329. Centrifugal pamp ; 

 330. Pumps ; Plunger pump ; 331. Forcing pump ; 

 Mixed pump ; Pistons ; Bramah's press ; Sucking 

 pump ; 332. Bag pump ; Lifting pump; Sucking and 

 forcing pnmp; Air vessel ; 333. Fire engine ; Roll- 

 er pumps and slider pumps ; 334. Arrangement of 

 pipes ; Bead pump ; Cellular pump ; Chain pump ; 

 Cranks ; 335. Wheels and rollers ; Chinese walking 

 ■wheels ; Inverted pump ; Hydraulic air vessels ; 336. 

 Fountain of Hero ; Atmospheric machines ; Hydraulic 

 ram ; 337, 338. 



Lecture XXIX. On pneumatic ma- 

 chines; 339- 



Counteraction and application of pneumatic forces ; 

 Torricellian vacuum ; Air pump ; 339. Double barrel ; 

 Smeaton's pump; Experiments; 340. Gages ;Peargage'; 

 S4J. Condensers ; Diving bells ; 342. Bellows ; Gas- 

 ometer! ; 343. Shower bellows ; Velocity of a blast ; 

 Ventilation; 344. Corn fan ; Chimnies ; 345. Fur- 

 naces ; Balloons ; Steam engines ; Saver/s engine ; 

 346. Newcomen's and Beighton's engine ; 347. Watt's 

 improvements ; 348. Power of Boulton and Watt's 

 machines ; Later alterations ; Gunpowder ; 349. Cal- 

 culations of Bernoulli and of Count Rumford ; pro- 

 perties of a gun ; 350. Bullets ; Shot ; Air gun ; 

 351. 



Lecture xxx. On the history of hy- 

 drauHcs and pneumatics ; 352. 



Discoveries of Archimedes ; 352. Ctesibius ; Hero ; 

 Viti'uvius ; 353. Canals ; Gunpowder ; Galileo; Tor- 

 ricelli ; 354. Castelli ; Mariotte ; Guglielmini ; Gue- 

 ricke; Hooke ; 355. Marquis of Worcester; 356. 

 Huygens ; Pardies ; Renaud ; James and John Ber- 

 noulli ; Newton ; Poleni ; 357. Bouguer ; D. Ber- 

 noulli ; 358. John Bernoulli ; Maclaurin ; 359. 

 VOL, I. 



Robins ; Dalembert ; Kaestncr ; 360. Eolcr ; Smea. 

 ton ; Borda; Watt ; Specification of Mr. Watt's pa- 

 tent ; 361, 362. Bossut ; Juan ; Prony ; 363. Chap_ 

 man; Romme ; Hutton ; Rumford; Du Buat ; 364. 

 Black ; Montgolfier ; 365. Chronological table ; 366. 



Lecture xxxi. On the propagation 

 of sound ; 367. 



Importance of acustics; Division^f the subject; De- 

 finition of sound; 367. Propagation of sound ; Velocity 

 ofsound;368. Delineation of a sound; 369. Com- 

 pressibility of hard bodies; Transmission of sound hy 

 different mediums; 370. Correction on account of 

 heat; 371. Transmission in gases of different kinds; 

 In liquids ; 372. In solids ; Divergence of sound ; 

 373. Reflection of sound; 874. Illustration by 

 waves of water; Speaking trumpet ;Whispering gallery ; 

 375. Invisible girl ; Partial interception of sound ; 

 Decay of sound; 376, 377. 



Lecture xxxii. On the sources and 

 effects of sound ; 378. 



Origin of a simple sound ; Of a continued sound; 

 378. Musical sounds derived from vibrations; Open 

 pipes; Stopped pipes; 379. Harmonic sounds; 

 Effect of temperature ; Longitudinal sounds of solids; 

 Lateral vibrations ;. 380. Flexible chords and mem- 

 branes; 381. Harmonic sounds of chords; 382. Loaded 

 wire; Revolutions of chords; 383. Vibrations of 

 clastic rods; 384. Vibrations of plates, rings, and 

 vessels; Mixed vibrations of solids and fluids ; 385. 

 Sympathetic sounds; Hearing; 386. Description of 

 the ear; 387. Delicacy of the car ; 388. 



Lecture xxxiii. On harmonics; 389. 



Theory of harmonics; Combinations of sounds; 389. 

 Beats; 390. Grave harmonics; Concords; 391. 

 Melody ; Rhythm ; Simple compositions ; Diatonic 

 scale; 399. Half notes or semitones; 393. Minor 

 mode; Discords; Rules of accompaniment; 394. Tem- 

 perament ; 395. Distinction of the notes ; 396. 



Lecture xxxiv. On musical instru- 

 ments; 397- 



Division of musical instruments; Harp; Lyre; 397. 

 Harpsichord; Spinet; Pianoforte; Dulcimer; Clavi- 

 chord; Guitar; 398. Violins of different kinds; 

 Vielle; Trumpet Marigni; Aeolian harp ; 399. 

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