456 



INDEX. 



PAGE 



Stars: size 4i3 



spectra 4ii 



temperatures, surface 411 



velocities 412, 41S 



Steam tables 234 



Steel: magnetic properties 3 6 7-3 7 



mechanical properties 76-79 



Stefan-Boltzmaim constant, and formula 247 



Steinmetz magnetic constant 375 



Stcllite, reflecting powers 150 



Stem correction for thermometers 190-191 



Stokes law for falling bodies 150 



Stone, mechanical properties 92 



Storage batteries 3i3 



Strengths — see mechanical properties 74-99 



Sucrose, viscosities of solutions, f(t) 156 



Sugar cane, densities aqueous solutions 126 



Sulphuric acid, densities aqueous solutions . . . . 126 



Sun: apex of solai' motion 411 



brightness 260 



disk brightness distribution 418 



distance to earth 414 



Fraunhofer lines 265 



magnitude, stellar 413 



motion 411 



numbers. Wolf's sun-spot 41S 



parallax 4^4 



radiation compared to moon 414 



constant (solar constant) 418 



variation with month and latitude . . 420 



spectrum: energy intensities 418 



Fraunhofer lines 265 



Rowland's wave-lengths 2-]2 



spot numbers, Wolf's 41S 



temperature 418 



velocity 411 



wave-lengths: Fraunhofer lines 265 



Rowland's 272 



Sunshine, duration of f(month, latitude) 417 



Surface resistivities, solid dielectrics 331 



Surface tensions i73. i74 



Susceptibility magnetic, definition 365 



elements, etc 377 



Tangents circular, nat. and log., f(°,') .... Z^ 



f (radians) ... 37 



hyperbolic, nat. and log 41 



Taylor's series 13 



Telegraphy, wireless: 362, 364 



Temperature, black-body scale for W 250 



brightness black body as function of. 261 



brightness scale for C 250 



color scale for W 250 



critical gas constants 212 



earth: f (altitude) 421 



f (latitude) 422 



monthly and yearly means . . 420 



variation below surface . . . 422 



flame temperatures 244 



ignition, gaseous mixtures 244 



standards xxxiv 



stellar 411 



sun's 418 



thermodynamic 19S 



zero absolute 19S 



Tensile strengths, see mechanical properties . . . 74-99 



Tension, surface i73) i74 



Tensions, vapor, see vapor pressures 175-186 



Terrestrial magnetism: agonic line 425 



declination 420 



dip 422 



inclination 422 



intensity, horizontal . . . 431 



total ..... 424 



magnetic character, yearly . 425 



observatories, elements at . 426 



Thermal unit, British 435 



standard calorie 435 



Thermal conductivity: alloys, metals 213 



building materials . 215 



earth 422 



gases 217 



high temperature 234 



Thermal conductivity: Insulators 



PAGE 

 . . . 214—216 



high temp. 214 



liquids 217 



metals, high temper- 

 ature 213 



salt solutions . . .216 



water 216 



Thermal diffusivities 217 



Thermal expansion: cubical: gases 222 



liquids 221 



solids 220 



linear: elements 218 



miscellaneous . , . .219 



Thermal unit: British 435 



calorie 435 



dynamical equivalents ... 197 

 Thermo-chemistry: heat of combustion: carbon cpds . 241 

 coals . . . 242 

 cokes . . . 242 

 gases . . . 242 

 liquid fuels .242 

 miscellaneous .241 

 peats . . . 242 

 heat of dilution, H2SO4 .... 246 



formation 245 



ions 246 



neutralization .... 246 

 Thermodynamical scale of temperature, ice-point . . 19s 

 Therraoelectrical properties: (emf) alloys .... 318 



platinum 319 

 elements . . . 317 

 Peltier . . 317, 321 

 pressure effects . 320 

 Thomson . 317, 320 



Thermoelements, calibration of 196 



Thermogalvanometric effect 385 



Thermomagnetic effects 383 



Thermometry: absolute zero 195 



air— 16III 0° to 300° C . . . . 193 



Sgiiij 100° to 200° C . . . 193 



SqIIIj high temperature ... 194 



calibration points, standard .... 19s 



gas-mercury, formulae, comparisons 192—194 



hydrogen— 1 6 Hi, 0° to 100° C . . 192 



x6ni, 59 _5» to 



— 35° C 193 



various 194 



ice point 195 



Kelvin scale 193 



mercury cf with gas 190-194 



platinum resistance 195 



resistance electrical 195 



stem corrections 190—191 



thermodynamic scale, ice-point . . . 195 

 thermo-electric, Cu-Constantan . . . 196 



Pt-PtRh 196 



Thomson thermo-electric effect 317,320 



Thorium radio-active group, constants of 396 



Threshold sensitiveness of eye 236 



Timber, strength of 96-99 



Timbre (sound) 149 



Time, equation of 416 



Time, solar, sidereal 414 



Time standards xxxiv 



Transformation constants of radio-active substances. 396 



Transformation points of minerals 207 



Transmissibility to radiation: air, moist . . . 308,419 

 atmospberic . . . .418 

 crystals, various . . . 306 



dyes 301 



glass, American . 303, 304 

 Jena .... 302 



water 307 



water-vapor . . 308, 419 



Trigonometric functions : circular, (° ') nat., log. . 32 



(radians), log . . 37 



hyperbolic, nat., log. .... 41 



Tribo-electric series 322 



Tubes, flow of gas through 15° 



Tuning forks, temperature coefficients 149 



Ultimate strengths of materials, see Mechanical. 



properties 74~99 



