734 



INDEX. 



Total reflection, 1.413, 461, 



II. 296. 

 Tottering equilibrium, I. PI. 



3. 

 Touch hole, II. 260. 

 Toughness, I. 142, C29, II. 



49. 

 Tout;hness of fibres, 11.185. 

 Toulon, II. 233. 

 Tourmalin, I. 674, II. 435. 

 Tourmalins, II. 323. 

 Tournefort, I. 748, 756. 



B. 1656, D. 17.-8. 

 Towing, 11. 243. 

 Toz7.etti, II. 107. 

 Trabuco, II. 155. 

 Trachea, I. 400. 

 Tracheae of birds, II. 279. 

 Tracheae of plants, I. 512. 

 Track of light, U. 281. 

 Traction, II. 55. 

 Tracts on wet docks, II. 



833. 

 Tractors, II. 428. 

 Tractory, II. 121, 123, 226, 



556. 

 Tractrix, II. 123, 556. 

 Trade winds, I. 701, 749, 



PI. 42, 43, II. 454. Coi^ 



recti on s. 

 Train of light, II. 303. 

 Traits des barometres, II. 



459. 

 Trait^ d'optiq«e, II. 280. 

 Traitg du deluge, II. 496. 

 Traits sur les barometres, 



II. 448. 

 Trajectories, II. 132. 

 Tralles, II. 367. 

 Transferring pictures, II, 



142. 

 Transfoimation of series, II. 



116. 

 Transit circle, I. PI. 35, 



II. 352. 

 Transit instruments, I. 541, 



PI. 35, II. 348, 352, 354. 



Transit of Mercury, II. 289. 

 Transit of the moon, II. 



357. 1 



Transit of Venus, II. 355. 

 Transits, II. 352, 365. 

 Transmission of heat, II. 



407. 

 Transmission of impulses, 



II. 618. 

 Transmission of light, II. 



321. 

 Transparency, II. 282. 

 Transparent mediums, II. 



70. 

 Transplanting turnips, II. 



212. 

 Transverse strain, I. 169. 

 Trapsfordrains, 11.235,246. 

 Trarer, II. 310. 

 Treatise on gunpower, II. 



260. 

 Trebra, II. 497. 

 Tree aloe, II. 185. 

 Trees, II. 199. 

 Trees electrified, II. 424. 

 Trerobley, II. 119, 324. 

 Tremcry, II. 666. 

 Tremors, II. 414, 510. 

 Trenches, II. 211. 

 Trenching plough, 11. 212. 

 Tressan, II. 416. 

 Trevithick, I. 336, 349, 11. 



259. 

 Triad, I. 393. 

 Triangle, II. 9 . . 16, 145. 

 Triangle, an instrument, 



To I. 401. 

 Triangle representing 



forces, I. PI. 3. 

 Triangles, II. 118. 

 Triangular compasses, I. 



102, PI. 6, II. 144. 

 Triangular framing, II. 241. 

 Tricliiurus Indicus, II. 436. 

 Trichurus, I. 724. 

 Trigonometrical instru- 

 ment, II. 145. 



Trigonometry, II. 118. 

 Triple stars, I. 494. 

 Tripoli, II. 210. 

 Trisection of an angle, II. 



145. 

 Trithemius, I. 189. 

 Trituration, I. 232, II. 213. 

 Trochi, II. Corrections. 

 Trochoid, I. 24, PI. 1. II. 



558. 

 Trombone, I. 402. 

 Trone pound, II. 161. 

 Tronthiemske selskab, 11. 



109. 

 Troostwyck, II. 419, 424. 

 Tropical year, I. 538. 

 Tropical revolutions, II. 



372. 

 Tropics, I. 570. 

 Trotter, II. 481. 

 Troughton, I. PI. 7, 8, II. 



148, 149, 161, 351,391. 

 Troy weight, II. 161. 

 Trudaiue's lens, If. 284, 



406. 

 Trumpet, I. 402, II. 260, 



275, 566. 

 Trumpet Marigni, I. 399, 



PI. 25, II. 267. 

 Trumpet marine, II. 274. 

 Tubes, I. 140, II. 50. 

 TuU, II. 212. 

 Tumbler, II. 257. 

 Tumbling figures, II. 184. 

 Tun, 1. 124, II. 151. 

 Tunica albuginea, II. 530. 

 Tunica conjunctiva, 11.530. 

 Tuning, II. 554. 

 Tuning fork, 1. 401, 656, IT. 



620. 

 Tunnel, II. 212. 

 Turf, II. 211. 

 Turin. Society of Turin, 



II. 109. 

 Turkey, II. 312. 

 Turner, II. 127, 235. 

 Turnery, II. 180. 



Turning bridges, 11. 178. 



Turning parapec, II. 174. 



Turnips, II. 208,' 209, 212. 



Turnor, II. 217. 



Tuscan columu, I. PI. 12. 



Tusser, II. 519. 



Twilight, I. 526, 566, PI. 



34, 11. 344. 

 Twilight of Venus, II. 333. 

 Twinkling, I. 490. 

 Twinkling of the stars, II. 



331. 

 Twins, I. 497. 

 Twisted ropes, I. 70. 

 Twisted wire, II. 383. 

 Twisting, 1. 134,181,11.186. 

 Twitching wool, II. 185. 

 Tycho Brahc, I. 596, 597, 



604, II. 324. B. 1546, D. 



1601. 

 Tychonic system, I. PI. 38. 

 Tympanum, I. 387. 

 Type metal, I. 122,11. 158. 

 Typography, II. 158. 

 Types, II. 158. 

 Tyrrhene pipe, II. 567. 

 Ubaldi, I. 247. 

 Udina, II. 494. 

 Ulloa, I. 363, 511, II. 308, 



346. B. 1716, D. 1795. 

 Ultimate ratios, II. 16, 551. 

 Ulugh Beigh, I. 595, 596, 



604. 

 Umbrella, I. 375i 

 Umbrellas, II. 180. 

 Unannealed glass, II. 403. 

 Unctuous substances, II. 



171. 

 Undershot wheel, I. 321, 



PI. 22. 

 Undulations, II. 615. 

 Undulations of light, 1. 465, 



II. 627, 632, 640. 

 Undulatory system of liglity 



II. 70. 

 Unequal balance, I. PI. &, 

 Unger, II. 279. 



