454 



INDEX, 



PAGE 



R, gas constant 4o8 



p, Poisson's ratio loi 



Kadian 436 



circular functions in terras of 37 



Radiation: black-body, formulae 247 



f(\,T) 247,248 



total, f(t) 247 



candle 260 



constants, (T, Ci, C2 247 



cooling by, across airspaces . ... 253 

 high temperatures . . . .254 

 ordinary temperatures . . . 253 

 pressure effect . . . 251-252 



emissivities 249, 250 



eye sensitiveness to 256-258 



f(X) 256,25s 



moon's compared to sun's 41 S 



Planck's formula 247 



a, Stefan's formula 247 



solar constant of 418 



variation with latitude 420 



month 420 



Stefan's formula 247 



sun's to earth 41S 



sun's compared to moon 41 5 



temperature as function of 250 



transmissibility of by air, moist . 308, 419 



alum 305 



atmosphere . 308, 419 

 crystals, f(X) . . 305 

 dyes, f( ) • • • 301 

 fluorite, f(X) . . 305 

 glass, f(X) .302-304 

 ice-land spar . . 305 

 lamp-black . . . 309 

 long-wave, f(X) . 309 

 quartz, f(X) . . 305 

 rock-salt, f(X) . 305 

 water, f(X) . . 307 



visibility of by eye 256, 258 



Eadii of gyration 70 



Eadio-activity 394-39^ 



a rays: helium 394 



ions produced 398 



kinetic energy 396 



number produced 396 



production of 394 



range 396 



stopping powers for .... 395 



velocity, initial 396 



actinium group 396 



jSrays: absorption coefficients . 395,397 



ions produced 398 



velocities 397 



7 rays: absorption coefficients . 395, 397 



ions produced 398 



constants, various 396—397 



Curie unit 398 



emanation 398 



general characteristics 394 



heating effects 394 



helium. Production of 394 



Ions produced by a, j3 and 7 rays . 398 



isotopes 410 



Mache unit 398 



phosphorescence 394 



radium group 396 



spectra 398 



standard, international 394 



thorium group 396 



transformations 396,410 



transformation constants 396 



vapor pressure of emanation . . . 398 



Radium emanation, vapor-pressure 398 



group 396 



spectra ' 398 



Radius hydrogen atom 408 



Reciprocals iS 



Reflection of light: formula 297 



long-wave 309 



metals 295—298 



miscellaneous 298 



f(n,i) 297 



pigments dry, f(X) 299 



polarization by 297 



rough surfaces 299 



stellite 296 



variation with angle .... 300 

 temperature . . 300 



PAGE 



Refraction index: air, f(X) 293 



alum 281 



crystals, see minerals . . . 279-289 



fats 289 



fluorite, f(t) 280 



gases 292 



glasses, American, f(X) . . . . 277 



Jena, f(X, t) 278 



Iceland-spar 280 



liquids 290 



liquefied gases 289 



microscopic determination media . 294 



minerals, biaxial, positive . . . 286 



negative . . .287 



isotropic 282 



uniaxial, positive . . . 284 

 negative . . . 284 



miscellaneous, biaxial 289 



isotropio .... 283 



uniaxial .... 285 



nitroso-dimethyl aniline . . . .280 



oils 289 



quartz . . .' 280 



rock-salt, f(t) 279 



salt solutions 291 



silvine 279 



vapors 292 



waxes 289 



Relative humidity, vapor pressure and dry . . . . 187 



wet and dry 189 



Resistance, air (aerodynamical) 1 51-153 



planes 151 



angle factor 152 



aspect factor 152 



shape factor iS3 



size factor iS3 



skin friction 152 



speed factor 153 



Resistance, resistivity electrical (see conductivity). 



alloys, t(t) 323,327-328 



aluminum 334 



wire tables 342, 343 



alternating current values 344 



antennas (wireless) 364 



copper, f(t) 334, 335 



reduction to standard temperature 335 



wire-tables, English units . . . 336 



metric tinits . . .339 



dielectrics, volume, surface 331 



electrolytic, see conductivity . . . 345-352 



equivalents 3" 



glass, f(t) 332 



high frequency values 344 



high temperature values 330 



low temperature values 330 



magnetic field, effect of 384 



mercury resistance standards .... xsxvlii 



metals, f(t) 323 



porcelain, f(t) 332 



pressure effect 326 



standards, mercury xxxviii 



surface, of dielectrics 331 



thermometer, platinum resistance . . . 195 



volume, of dielectrics 331 



wire, auxiliary table for computing . . 322 



wire tables, aluminum, common units . 342 



metric .... 343 



copper, common units . . 336 



metric 339 



Resolving power photographic plate 263 



Resonance potentials (spectra) 403 



Retina, physiological data 258 



sensitiveness to light and colors . . . 256-258 



Rigidity of enrth 427 



Rigidity moduli, f(t) 100 



Ritz spectrum series formula 275 



Rocks, specific heats of 229 



Rock-salt, index of refraction 279 



Rods in retina of eye 258 



Rontgen rays: 383-393 



absorption coefficients (mass) . . . 389 

 atomic numbers and spectra . . 390-393 



cathode efficiencies 387 



corpuscular radiation 387-388 



characteristic radiations 387 



energy relations 387 



general radiations 387 



