42 



GENERAL INDEX. 



Water, compressibility of, experiments on 

 distillation of. in vacuo . 



Page 



. . . HYDROSTATTCS . i 



HEAT . .58 



force and peculiarity of its expansion .... . . .12 



elasticity of, experiments on . . \ . HYDROSTATICS . 1,2 



freezing, phenomenon of ....<> HEAT . . .43 



in vacuo and in large quantities . . . . . . f 54 



pressure of, its power and effects .... HYDROSTATICS .* 7 



Wafer-pressure engine described ..... HYDRAULICS . 



Water-ram, description of that machine . * 



Water-wheels, various kinds of ..... . 6 29 



power of, calculations on .... . . 27 



overshot, proper construction of . . . 24. MECH. 19 



undershot . 23. 22 



. . velocity of their motion, observations on . . 27. 23 



of steam-boats . ... HYDRAULICS . 24 



Water-with, a plant valuable for its contained water . . . PRELIMINARY TREAT. 32 



Watt's improvements on the steam-engirfe detailed . , , HEAT . . .47 



sun and planet wheel described . . . MECHANICS, t. ii. . 63 



Waves of light, description of the phenomenon . . . OPTICS . . ^ . 31 



Weather-glass, or barometer, its construction . . . PNEUMATICS . 10 



Rules for predicting the weather by the . . .11 



Wedge, described as a mechanical power . . MECHANICS, t. ii. . 4? 



Wedgewood's pyrometer, account of ..... HEAT . . .19 



scale of, compared with Fahrenheit's . . . 



Weighing machine, construction of . . . . . MECHANICS, t. ii. . 12. 



Weight, definition and cause of . . . . . i- 



comparative, of bodies at the sun and different planets PRELIMINARY TREAT. 40 



of air, concerning the ...... HYDROST. 1. PNEUM. 4 



of the atriiosphere ...... PNEUMATICS , 6,14 



of latent heat investigated ..... HEAT . 



distinguished from power MECHANICS, t. ii. . 1 



Wheel. See Water-wheel. 



and axle, single . . . . . . .. . 22 



double . 24 



combinations of . . . 27 



Wheel-barometer, construction of ..... PNEUMATICS . . 9 



Wheels, bevelled, crown, lantern and spur, described . , MECHANICS, t. ii. . 30 



and pinions, concerning . . . . . , . .27 



Wheel, Persian, description of ...... HYDRAULICS . 6,22 



Wheel-work, complex . . , . . MECHANICS, t. ii. 26 



proper form of the teeth in . . ; . . 28 



Wheel, sun and planet, described . . . . . . . 63 



White, a mixture o'f all colours . . . . PRELIMINARY TREAT. 37 



. . light, decomposition of . . , . . OPTICS . . .22 



White's pulley described MECHANICS, t. ii. . 35 



Wild-pine, its curious water-reservoirs ..... PRELIMINARY TREAT. 32 



Windlass, description of that mechanical power ... MECHANICS, t. ii. . 23 



WinU-mills, proper angles of their sails ..... i. . 25 



Wine-coolers, their effect in diminishing heat , . . HEAT . . 55 



Wine, spirit of, how manufactured . . . . . . .56 



Wirtembcrg syphon, description of .... PNEUMATICS . 27 



Wolfaston's Cryoph'orus or Frost-bearer, described . . HEAT . . .55 



Worcester's (Marquis of) steam-engine . . , . MECHANICS, t. i. 



Working-point of a machine, defined . . . . 



Works on friction and rigidity of cordage, referred to . 



heat, referred to . . . . . . 

 . . hydraulics ..... 



.. hydrostatics . . . 



mechanics . . . , 

 pneumatics ..... 



. . polarisation of light . . . 



Ximenea" experiments on friction . 



Zero of heat in bodies, according to Dr 

 Zoology, definition and objects of the ! 

 Zurcda's method of producing convr 



