006 



INDEX. 



245, 247, 260, 262, 278, 282, PI. 5, 11 ; b. 1724, 



d. 1792. 



Smeaton's blocks, PI. 4. 

 Smith, 335, 3/9 ; d. l/W. 

 Smith's microscope, 335, PI. 28. 

 Smoke, 356. 

 Smoke jack, 247- 

 Smoky chimnies, 265. 

 Snellius, 376 ; b. 1591, d. 1626. 

 Snow, 348, 556, PI. 29. 

 Society for the encouragement of arts, 192. 

 Socrates, 181. 

 Softness, 482. 



Solar and culinary heat, 488. 

 Solar atmosphere, PI. 31. 

 Solar day, 426. 



Solar microscope, 332, PI. 28. 

 Solar phosphori, 341. 

 Solar system, 397, PL 32. 

 Solar tides, 447- 

 Solidity, 480. 

 Solids, 470. 



Solution of iron filings, 538. 

 Sorge, 317. 

 Sosigenes, 455. 

 Sothic period, 452. 

 Sound, 287, 503. 

 Sounding board, 311. 

 Sounds of rods, 317. 

 Sources of heat, 484. 

 Sources of light, 340. 

 Sources of motion, 68, 69, 101. 

 Sources of sound, 295. 

 South, 398. 

 South America, 74. 

 South pole, 533. 

 Space, 15, 388. 



Spallanzani, 586 ; b. 1?29, d. 1799. 

 Spark, 516, PI. 40. 

 Speaking trumpet, 293, 294, PI. 25. 

 Specific gravities, 236. 

 Specific gravities of gases, 291. 

 Spectrum, 343, PI. 29. 

 Sphere, 90. 



Sphere charged with electricity, 510. 

 Spheres, 410. 

 Spheres connected, 510. 

 Spheroid, 442. 

 Spica Virginis, 395. 

 Spider's thread, 104. 

 Spider's web, 109. 

 Spinet, 311. 

 Spinning, 139. 

 Spinning wheel, 187- 

 Spiral pipes, 251. 

 Spiral pump, 252, PI. 22. 

 Spirit, 544. 



Spirit level, 81,237, PL 21. 

 Spirit of wine, 291,475. 

 Spirit thermometer, 497. 

 Spiritual substances, 468. 

 Sponge, 479. 



Spots of the sun, 398, PL 31. 

 Spring, PL 2, 10. 

 Spring of a coach, 114. 

 Springs, 137, 166. 

 Springs of water, 216, PL 20. 

 Spring steelyard, 98, PI. 9. 

 Spring tides, 442, 447- 

 Spur wheel, 136, PL 15. 

 Squares, 78. 



Stability of a balance, PL 8. 

 Stability of a wedge, 119. 

 Stability of equilibrium, 47, 198, PI. 3. 

 Stability of floating bodies, 202, PL 19. 

 Stability of fluids, PL 19. 

 Stability of ships, 249. 

 Stacada, 313. 

 Stadium, 454. 



Stahl, 586 ; b. 1660, d. 1734. 

 Stamping, 172. 

 Standard measures, 82. 

 Standard weights, 95. 

 Stanhope, 51, 252,507, 512. 

 Star Lyra, PI. 31. 

 Stars, 356, 387, PI. 36, 37- 

 Statical baroscopes, PL 19. 

 Statics, 71, 95. 

 Statics of fluids, 235. 

 Stationary planets, PL 34. 



Statuary's compass, PL 7- 



Steam, 205, 474. 



Steam boat, PI. 29. 



Steam engine, 37, 103, 265, 282, 283, PI. -24. 



Steam vessels, 271. 



Steel, 174,531. 



Steelyards, 96, 97, PL 8, 9. 



Steelyard with a crane, 161. 



Stencilling, 72. 



Stereographical projection, 90, PL 8. 



Stereotype printing, 94. 



Stevin, 286. 



Stevinus, 189 ; d. 1633. 



Stick broken by a blow, 65. 



Stiffness, 108, 482. 



Stile, 75. 



Stirrup, 302. 



Stockings, 187. 



Stodart, 174. 



Stone, 116. 



Stone cutting, 176, 177. 



Stones fallen, 564. 



Stones joined, PI. 11. 



Stopcocks, 242, PI. 21. 



Strabo, 442. 



Strain, 130. 



Strand, 140. 



Strap, 129. 



Straps for beams, PL 13. 



Straps for wheels, PL 15. 



Stray Park engine, 269. 



Stream, 245. 



Stream of a fluid, PL 20. 



Stream of air, PL 21. 



Stream of electricity, 517. 



Streams of air from electricity, 512. 



Strength, 110, 111, 482. 



Strength of a column, PI. 10. 



Strength of different substances, 116. 



Strength of flood gates, 239. 



Strength of joints, PI. 13. 



Strength of materials, PI. 11. 



Strength of muscles, 98. 



Strength of ropes, 141. 



Striking a magnet, 538. 



Striking part, 155. 



String of baskets, 168. 



Stripes of colours, 365, PL 30. 



Strongest forms, 114, 115, PL 10. 



Sturm, 291. 



Subdominant, 307. 



Subterraneous fires, 560. 



Sucking and forcing pump, 255. 



Sucking pump, 254, PL 23. 



Suction, 207. 



Sugar mill, 170, PL 18. 



Sulfate of soda, 493. 



Sulfuric acid, 525. 



Sulfurets, 524, 525. 



Summer, 417, 547. 



Sun, 356, 397. 



Sun and planet wheel, 137, 267- 



Sun's motion, 411. 



Sun's parallax, 431. 



Sun's path, PI. 34. 



Sun's rays, 325, 496, 545. 



Sun's spots, PL 31. 



Superficial cohesion, 475. 



Superior tides, 446. 



Supernumerary rainbows, 369. 



Support, PL 3. 



Supports for clocks, 155. 



Surface of a fluid, 197- 



Surface of a liquid, 476. 



Surface of the sea, 435. 



Surfaces of fluids, PI. 39. 



Surging the messenger, 158. 



Suspension, 32. 



Suspension of a weight, PL 3. 



Swan, 394. 



Swig, 53, PL 4. 



Swiftest descent, 35. 



Symington, 246, 271, PI. 24. 



Sympathetic sounds, 301. 



Sympathy of clocks, 155. , 



Synchronous tide, 443. 



Synthetical order, 7- 



Syrinx, 341. 



System of Ptolemy, 455. 



Systems of the world, PI. 38. 



