INDEX. 



00,5 



Riccati, 300, 317- 



Richmann, 278, 580, 585 ; d. 1753. 



Rifle barrels, 31, 268. 



Right ascension, 425, 430. 



Ringing, 101. 



Ringing a magnet, 538. 



Ring of Saturn, 404, 407, 458. 



Ritter, 342, 382, 490, 588. 



Rise and fall of the tides, 446, 447. 



Rising and setting, 433. 



Rivers, 222, 238, 438, 563. Tides of rivers, 446. 



Road. Circular road, 37. 



Robertson, 334. 



Roberval, 458- 



Robins, 31, 281, 284, 285 ; b. 1707, d. 1751. 



Robison, 22, 32, 101, 112, 192, 223, 253, 264, 285, 



291, 469, 481, 507. 538, 586 ; b. 1739, d. 1804. 

 Rochon, 93, 490. 

 Rock salt, 504. 



Rods, 86, PI. 9, 14. Sounds of rods, 300. 

 Roemer, 341, 378; b. 1644, d. 1710. 

 Roget, 542. 

 Roller, PL 17- 

 Roller pump, 256, PI. 23. 

 Rollers, 163. 

 Rolling, PI. 2. 

 Romans, 91, 186. 

 Roman year, 427- 

 Rome, 547. 

 Romieu, 317- 

 Romme, 284. 

 Roof, 55, 130, PI. 5. 

 Roofs, PI. 13. 

 Rope making, 139. 

 Rope pump, 250, PI. 21. 

 Ropes, 140. 

 Rosetta, 564 

 Rosnier, 285. 

 Rotation, 32, 61, 65. 

 Rotation of billiard balls, PI. 5. 

 Rotation of the earth, 417, 548. 

 Rotation of the moon, 406, 414. 

 Rotation of the planets, 402. 

 Rotation of the sun, 398. 

 Rotatory motion, PI. 5. 

 Rotatory power, 63, PI. 2. 

 Rotatory pump, 253. 

 Rowing, 101. 

 Roy, 8<i. 

 Royal Institution, 131, 192, 589. Objects of the 



Royal Institution, 1. 

 Royal Society, 5, 97, 161, 190, 191, 585. 

 Rudder, 249. 

 Rudders, 114. 

 Rudolph, 457. 

 Rulers, 77. 



Rules of philosophy, 12. 

 Ruling machine, 91. 

 Rumford. Count Rumford, 268, 284, 285, 329, 



485, 487, 500, 588. 

 Running, 100, PI. 9. 

 Rupert. Prince Rupert, 256. Prince Rupert's 



drops, 494. 

 Russell, 423. 

 Rutherford, 544. 

 Rutherford's thermometer, PI. 41. 



Sagittarius, 401. 



Sail, PI. 22. 



Saint Paul's cathedral, 127. 



Saint Pierre, 460, 461. 



Sanctorius, 147,189,498; b. 1561, d. 1636. 



Sap, 569. 



Saracens, 145, 187, 188. 



Saros, 452. 



Satellites, 405, 406, PI. 33. 



Saturn, 404, 424, PI. 33. 



Saturn's ring, 404, 407, 458. 



Saussure, 489, 552, 554, 587. 



Sauveur, 317- 



Savery, 265, 279, PL 24. 



Saw, PL 4. 



Sawing? 1?5. 



Saxton, 541. 



Scale of heat, 496. 



Scale of musical notes, 307- 



Scaliger, 429. 



Scapement, 148. 



Scapements, PL 16. 



Scarfing, 129, PL 13. 



Schaeffer, 189. 



Scheele, 586; b. 1742, d. 1786. 



Scheiner, 376 ; b. 1573, d. 1650. 



Schemnitz, 257, 258, PI. 23. 



Schott, 278. 



Schroeter, 403, PL 33. 



Scorpio, 395, 401. 



Screen of glass, 489. 



Screw, 55, 160, PI. 5. 



Screw of Archimedes, 251, 252, PL 22. 



Screws, 160. 



Sculling, 101. 



Sculpture, 71. 



Sea, 437, 443, 444, 546, 563. 



Sea breezes, 550. 



Seamanship, 248. 



Seasons, 417, PL 34. 



Secants, 82. 



Secondary mountains, 439. 



Section of a canal, PL 21. 



Sector, 79, PL 7. 



Seebeck, 371, 490. 



Segner, 66, 589. 



Seguin, 586. 



Self registering thermometers, 545. 



Semaphore, 77- 



Semimaterial existences, 468. 



Semiramis, 182. 



Semitone, 307. 



Semivowels, 313. 



Seneca, 182, 374, 442 ; b. 8, d. 65. 



Sensation, 567. 



Sensation of colours, 345. 



Sensation of light, 320. 



Senses, 577. 



Sensibility of the retina, 352. 



Sensible effects of electricity, 519. 



Sensible effects of the celestial motions, 415. 



Serein, 555. 



Series of eclipses, 420. 



Series of rods, PI. 14. 



Serpent, 314. 



Serpentarius, 393, 395. 



Serpentes, 575. 



Servetus, 584. 



Serviere, PL 23. 



S'Gravesande, 191 ; b. 1688, d. 1742. 



Shadow, 367, PI. 30. 



Shaw, 566. 



Sheffield, 187. 



Shehallion, 440. 



Ship, 114, 248, 249, PI. 22. 



Ships, 231. 



Ship's sails, 281. 



Ship's way, PL 22. 



Shooting stars, 564. 



Shore, PL 5. 



Short, 461. 



Shot, 268. 



Shower bellows, 263, PL 24. 



Showers of stones, 562. 



Shroud, 140. 



Sidereal day, 426. 



Signs of the ecliptic, 401. 



Signs of the zodiac, 451. 



Silk, 142. 



Silkworm's thread, 104. 



Simonides, 315; b. 579, d. 469, B.C. 



Simple sounds, 295. 



Simpson, 191, 379, 545, 547 ; b. 1711, d. 1761. 



Sine of an angle, 81. 



Single vision, 355. 



Siphon, 215. 



Siphon of Hero, 145. 



Siphons, 241. 



Sirius, 391, 392, 395, 397- 



Sisson, 461. 



Six, 547, 555. 



Six's thermometer, 544, PI. 41. 



Size, 73, 144. 



Sky, 356, PI. 30. 



Slider pump, 256, PI. 23. 



Sliding rule, PL 7. 



Sling, 26, 17a 



Slitting mill, 174, PL 18. 



Sloughing, 570. 



Sluice, PL 21. 



Sluices, 239. 



Smeaton, 53, 60, 64, 122, 123, 129, 159, KB, 240, 



