68o 



INDEX 



Tungsten: color temperature 322 



electron emission 321 



emissivity, luminous, color 322 



expansion coefficient 321 



heat, atomic 321 



content 321 



mechanical properties 125 



power radiated 321 



radiation 323 



resistivity 321 



spectrum emissivity 322 



vapor pressure 321 



Twilight 602 



Ultimate lines of elements (spectrum) .. .504, 507-508 



strength of materials no et seq. 



Ultimes, raies, of elements (spectrum) .. .504, 507-508 



Units: (general) xxxi et seq. 



ampere turn liv 



derived xxxii 



electrical xlvi et seq., 397 



fundamental xxxi, xxxix 



Gaussian xliii 



International xliv 



standards xlvi et seq. 



magnetic lii, liv 



photometric 333 



radioactivity 520-521 



Uranium radioactive family: (general) 516 



average life 516 



decay value 516 



half period 516 



v, ratio e.m.u. to e.s.u 74 



Vacuo, reduction of densities to 109 



weighings to 109 



Vacuum, technique of high 655 



Valencies of the elements 483 



Vapor pressure: alcohol, ethyl 227 



methyl 227 



aniline 228 



aqueous solutions 230-231 



of salts 230 



vapor in atmosphere, 



f (altitude) 234, 235 



bromobenzene 228 



carbon disulphide 228 



chlorohenzene 228 



elements 224 



low temperature 226 



mercury 229 



organic liquids 225-226 



salts in water 230 



tungsten 321 



water in atmosphere 234, 235 



, water: weight per m 3 and ft. 3 234 



Vaporization, latent heat of 295 et seq. 



ammonia 296 



elements, theoretical.. 295 



formulae 296 



mercury 306 



steam tables ....297-306 



rate of 223 



Vapors: densities 176, 298-306 



diffusion of 216, 217 



heats of vaporization 295-296, 298-306 



, specific 293 



pressures {see vapor pressures) 223 et seq. 



refractive indices 373 



specific heats 293 



viscosities 213 



water, transparency to radiation 392 



Variable stars (see under stars) 634-635 



Velocities: earth: linear, rotation 570 



orbital 570 



light, 2 • 99796 x io 1 " cm/sec 74 



molecules 550 



sound 1 90-1 9 1 



in sea water 652 



stellar: greater proper motions 628 



mean 617 



radial>ioo km/sec 628 



space v., large and small 627 



sun 625 



Verdets' constant 478-479 



Vertical intensity, earth's magnetic field (world 

 chart) 580 



PAGE 



Vessels, vol. of glass, via Hg or H 2 (I. C. T., 6, 



439) 108 



Villari magnetic effect, definition 463 



Viscosity : air 213 



alcohol (aqueous), f(t, dilution) 205 



castor oil 206 



centipoise, definition 205 



earth 569 



gases, f(t. p) 213, 214 



glasses, high temperature 656 



glycerol, dilution variation 206 



liquids 207, 209 



f (p) 208-209 



mercury 656 



sea water 652 



solutions 210-212 



specific, of solutions 212 



sucrose (aqueous), f(t, dilution) 206 



vapors 213 



water, f (high pressure) 656 



f(t) 205 



Visibility of radiation 332 



white light 340 



Vision, distinct 332 



persistence of 332 



Voice, pitch limits 194-195 



Volt, absolute li 



definition 660 



international xlix 



Volt-ampere, definition 660 



electron 502 



energy 106 



speed 106 



wave length 107 



Volta potentials 548, 549 



Voltages: contact 399, 548, 549 



electrical equivalents 397 



Peltier 406 



primary cells 398 



salt solutions and metals 400 



secondary cells 398 



solids and liquids 399 



standard cells xlix-li 



thermoelectric: (general) 401 et seq. 



against Pb 401 



Pt 403 



alloys 402, 403 



Al-Pt 404 



Cd-Pt 404 



metals 402 



low temperatures. . 404 



neutral points 401 



Ni-Pt 404 



pressure effect 407 



Pt-PtRh 403 



Zn-Pt 404 



tribo-electric series 408 



voltaic cells 398, 400 



Weston cells xlix-li 



Voltameter, silver xlviii, 77 et seq. 



Volts, electrical equivalents 397 



international xliv, 397 



Volume, atomic 289 



critical, for gases 271 



gases, f(t) with logs 149-152, 155 



glass vessels, determination of 108 



mercury, — 10° to +360° C 169 



perfect gas 103 



resistance of dielectrics 418 



water, f (t, p) 167 



— 10° to +250 C 168 



Vowels, resonance of spoken 195 



Waidner-Burgess standard light 334 



Water: boiling point, f (pressure) 188, 253 



density: f (t) o° to 41° C 166 



—10° to +250° C 168 



maximum, 0.999973 g/cm 3 75 



sea water 652 



solutions: alcohol, ethyl ....172, 173 



methyl 1 74 



glycerol 206 



sucrose 174. J 75 



sulphuric acid 174 



freezing point, f (pressure) 253 



ionization 438 



melting point, f (pressure) 253 



