<)08 



INDEX. 



Vinci. Da Vinci, 189 ; b. U4. r ,, d. 1520. 



Viola diGamba, 312. 



Violin, 312. 



Violoncello, 312. 



Viper, 575. 



Virgo, 401. 



Virtual focus, 324. 



Virtual image, 329, PI. 27- 



Virtual velocities, 56. 



Viscosity, 482. 



Vision, 350. 



Vitellio, 375; fl. 1269. 



Vitreous electricity, 517- 



Vitreous humour, 351. 



Vitruvius, 145, 186, 276, 277, PI. 22; fl. 15, B.C. 



Voice, 312, PJ. 26. 



Volcanos, 560. 



Volcanos in the moon, 423. 



Volta, 521, 523, 524, 528, 661, 563, 586, 587, 588, 



PI. 40. 



Voltaic current, 539, 549. 

 Voltaire. See 194 ; b. 1694, d. 1778. 

 Vowels, 313. 



Vox humana pipe, 314, PI. 26. 

 Vulcanian theory, 563. 



Waggon overturning, PI. 3. 



Wain, 394. 



Walking, 100, PI. 9. 



Walking wheels, 160, 257- 



Wall, 122. 



Wallace, 79. 



Wallingford, 145,188; fl. 1326. 



Wallis, 28, 190, 316 ; b. 1616, d. 1713. 



Walter of Coventry, 188; fl. 1213. 



Waring, 192. 



Watches, 192. 



Watch scapements, PI. 26. 



Water, 209, 291, 323, 475, 477- 



Water colours, 73. 



Water in air, 554. 



Waterloo Bridge, 271. 



Water mill, 103. 



Water pipes, 241, PL 21. 



Water screw, 251, PI. 22. 



Water snail, 251. 



Waterspouts, 559. 



Water-wheels, 230, 244, 282, PL 22. 



Water whimsey, 157. 



Watt, 37, 51, 101, 103, 187, 192, 265, 266, 267, 



269, 282, 283, PL 24. 



Waves, 218, PL 20. Combinations of waves, 220. 

 Wax candle, 486. 

 Weather, 550. 

 Weaving, 142. 

 Wedge, 54, 119, PL 4. 

 Wedge moving in water, 230. 

 Wedges for stones, PL 11. 

 Wedgwood, 192, 497 ; <L 1795. 

 Weidler, 406. 

 Weighing, 95. 



Weighing machines, 97, PI. 9. 

 Weight, 12, PL 3. 

 Weight of air, 207. 

 Weight in air, 29. 

 Weight of animals, 117- 

 Weights of clocks, 137. 

 Wells, 655. 

 Were, 224. 

 West, 398. 

 Westerly winds, 549. 



Westgarth, 257- 



Westminster Abbey, 188. 



Wet leather, 482. 



Whale, 395. 



Whalebone hygrometer, 554. 



Wheat, 95. 



Wheel, PL 1, 14. 



Wheel and axis, 51, PL 3. 



Wheel carriages, 164, PL 18. 



Wheel cutting machine, 137. 



Wheelcutters, PL 15. 



Wheel of Orfyreus, PL 6. 



Wheels, 164, 165, 166. 



Wheels and pinions, 52. 



Wheels with straps, PL 15. 



Wheelways of iron, 167- 



Wheelwork, 134. 



Whimsey, 157. 



Whip, 174. 



Whirling table, 27, 198, PL 1. 



Whirlpool, 216. 



Whispering gallery, 294. 



Whistling, 314. 



Whitehurst, 85, 145, 146, 259. 



White light, 342. 



White's crane, 161, PL 17- 



Wilfrid, 186. 



Wilke, 586. 



Wilkins, 285 ; b. 1614, d. 1672. 



William of Sens, 188. 



William IV., 457. 



Willughby, 585 ; b. 1635, d. 1672. 



Wilson, 399, 525, 559, PL 31. 



Winch, 101, 134, 157, PL 3. 



Wind, 246, 550. 



Wind and water, 246. 



Wind gages, 243. 



Windmills, 103, 246, 247, 277,281. 



Winds, 544, 548. 



W inkier, 585, 586; b. 1703, d. 1770. 



Winter, 417, 547. 



Wire, 187. 



Wire drawing, 171. 



Wirtz, 252, 253, PL 22. 



Wollaston. Dr. Wollaston, 329, 331, 332, 342, 



343, 346, 348, 349, 382, 490, 588, PL 27. 29, 39. 



Rev.F. Wollaston, PL 35. 

 Woltman, PL 22. 

 Wood, 116. 

 Wood cuts, 91. 

 Wooden bridges, 131, PL 14. 

 Wool, 142. 



Woollen manufactures, 186. 

 Worcester. Marquis of Worcester, 265, 278, 279 ; 



d. 1667. 



Work of a labourer, 101, 178, 253. 

 Wren, 190, 459, 461 ; b. 1632, d. 1723. 

 Writing, 71, 74, 75. 

 Wunsch, 292. 



York Minster, 188. 

 Young. M. Young, 213. 

 Young, Dr. T., 270, 370, 371. 



Zenith sectors, 429, PL 35. 



Zero, 500. 



Zodiacal light, 399, PL 31. 



Zones, 436. 



Zucchius, 381. 



Zuyder Zee, 564. 



THE END. 



Printed by J. & H. Cox (Brothers), 74 & 75, Great Queen Street, 

 Lineoln's-Inn Fields. 





