INDEX. 



449 



PAGE 



Rontgen rays: heterogeneous radiations 387 



homogeneous radiations 387 



independent radiations 387 



intensity 388 



ionization 388 



K series of radiations 39<> 



L series of radiations 39 1 



M series of radiations 392 



monochromatic radiations 387 



secondary radiations 387 



spectra: absorption 393 



K series 390 



L series 391 



M series 392 



tungsten 392 



wave-length and cathode fall .... 387 



Roots of Bessel functions, ist and 2nd orders . . 68 



Roots square 15 



Rope, manilla, mechanical properties 95 



steel wire, mechanical properties 79 



Rotation of polarized light 310 



magnetic .... 378-382 



Rough surfaces, reflecting power 299 



Rowland solar wave-lengths 272 



Rupture, moduli of 74 et seq 



Rutherford atom 401 



Kydherg constant 408 



Rydberg series formula (spectrum) 275 



a, Stefan-Boltzmann 247 



Salt solutions: boiling point raising 210 



conductivity thermal 216 



freezing point lowering 208 



vapor pressure . . . 181 



Scales, musical 148 



Scleroscope (hardness test) 74 



Screens, color 306307 



Second pendulum, formula 419 



sea-level values, f(0) 419 



Secohm xliv 



Secondary batteries 313 



X-rays 387 



Self induction 376 



Sensation, Minimum energy of light for 261 



Sensitiveness of eye to light and radiation . . 256-258 



Series, mathematical 13 



Series spectra: Balmer formula 401, 275 



first terms 276 



limits of 276 



Morgendorff formula 275 



Ritz formula 275 



Rydberg formula 275 



vibration differences 276 



Sheet metal, weight of 116 



Silver, electrochemical equivalent 345 



Silver voltameter xl 



Silvine, refractive index 279 



Sines, natural and logarithmic, circular 32 



hyperbolic .... 41 



Sky brightness 419 



Skin friction, air resistance 152 



Soap films 174 



Solids: compressibility 108 



contact potentials 314,316,404 



densities 113 



dielectric constants 360 



expansion coefficients, cubical 227 



linear .... 218-220 



hardness 74 et seq, 101 



magneto-optic rotation 379 



refractive indices 277-289 



resistance, electrical 323-344 



velocity of sound 146 



Verdet's constant 379 



Solubility: gases in water 170 



pressure effect . ... 171 

 salts in water, inorganic, f(t) . . . . 169 



organic, f(t) 170 



Solutions: boiling point raise by salts in .... 210 



conductivity electrolytic 346-352 



thermal 216 



densities of aqueous 122 



diffusion of aqueous 166 



dielectric constant, calibration stds. . . 360 

 freezing points lowering by salts in ... 208 

 magneto-optic rotation by 381 



PAGE 



Solutions: refractive indices 291 



specific heats 228 



surface tensions 173 



vapor pressures 181 



Verdet's constant 381 



viscosities, specific 1 59, 163 



Sound, velocity of: gases 147 



liquids 147 



solids 147 



waves, energy of 149 



Sparking potentials: air, alternating potentials . . 353 

 large spark-gaps, f(p) . . 354 

 steady potentials . . . .353 



dielectrics 355 



kerosene 355 



Specific heat of electricity 317 



Specific heats: ammonia, sat. liq 228 



elements 223, 225, 226 



gases, also c p /c r 230 



liquids 228 



mercury 227 



minerals and rocks 229 



rocks 229 



silicates 229 



solids 227 



vapors 230 



water 227 



Specific gravities (see densities) 109135 



conversion of Baume 109 



Specific inductive capacities: crystals 361 



gases, f(t,p) . . 356-357 

 liquids, f(t) . 357~359 



solids 360 



std. solutions . . . 360 



Specific molecular conductivity 347-348 



Specific resistance, see resistivity 323-326 



Specific viscosity: 159, 163 



Spectrum: black-body intensities 247, 248 



elements, international units . . . 267, 270 



eye sensitiveness, f(X) 256258 



iron standards, international units . 266, 267 



radium 398 



series, limits, first terms, etc 276 



solar: intensities of energy 418 



Rowland wave-lengths 272 



cor. to intern, scale . . 272 

 standard wave-lengths, intern, units. 266267 



stellar 403 



wave-lengths standards 266, 267 



reduction to std. pressure. 268 



X-ray: absorption 393 



atomic numbers 390393 



K series 390 



L series 391 



M series 392 



tungsten 392 



Speed of corpuscles 401 



Spherical harmonics 64 



Sputtering, cathodic ..." 386 



Squares of numbers 15 



Square roots of numbers 15 



Squares, least, formulae and tables 56-59 



Standard cells, emf of 313 



radium, international 394 



refractive media for microscope 294 



resistance, mercury xxxviii 



temperature calibration points 195 



wave-lengths: primary (international) . 266 

 secondary (international) . 266 

 tertiary (international) . . 267 

 reduction to std. pressure . 268 



Standards: electrical, international xxxviii 



fundamental xxxiii 



photometric 260 



Stars: brightness 413 



densities 413 



distances 412 



equivalent ist magnitude 4*7 



first magnitude data (positions, etc.) . . .415 



Harvard classification 4" 



light, total 417 



magnitudes, apparent and absolute 413 



masses 413 



motions 412 



number of 417 



parallax 415 



