45 



INDEX. 



FACE 



Stars: size 4'3 



spectra 4" 



temperatures, surface 4 11 



velocities . . . .' 41*. 4*5 



Steam tables *34 



Steel: ma&netic properties 367-376 



mechanical properties 7679 



Stefan-Boltzmunn 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, mechajiical properties 92 



Storage batteries 3 '3 



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 solar motion 4" 



brightness 260 



disk brightness distribution 418 



distance to earth 4*4 



Fraunhofer lines 265 



magnitude, stellar 4*3 



motion 4" 



numbers. Wolf's sun-spot 4*5 



parallax 4*4 



radiation compared to moon 4*4 



constant (solar constant) 41 



variation with month and latitude . . 420 



spectrum: energy intensities 4 T ^ 



Fraunhofer lines 265 



Rowland's wave-lengths 272 



spot numbers, Wolf's 41 5 



temperature 418 



velocity 41 1 



wave-lengths: Fraunhofer lines 265 



Rowland's 272 



Sunshine, duration of f (month, latitude) 417 



Surface resistivities, solid dielectrics 331 



Surface tensiens 173, 174 



Susceptibility magnetic, definition 365 



elements, etc 377 



Tangents circular, nat. and log., f(, ') .... 32 



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 195 



zero absolute 195 



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



Tension, surface 173, 174 



Tensions, vapor, see vapor pressures 175-186 



Terrestrial magnetism: agonic line 425 



declination 420 



dip 422 



inclination 422 



intensity, horizontal . . . 423 



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 254 



PAGE 



Thermal conductivity: insulators 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 . 24 1 



peats . . . 242 



heat of dilution, H 2 S0 4 .... 246 



formation 245 



ions 246 



neutralization .... 246 



Thermodynamical scale of temperature, ice-point . . 195 

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



platinum 319 

 elements . . . 317 

 Peltier . . 317, 321 

 pressure effects . 320 

 Thomson . 317, 320 



Thermoelements, calibration of ^96 



Thermogalvanometric effect 385 



Thermomagnetic effects 385 



Thermometry: absolute zero 195 



air i6Hl o to 300 C .... 193 



59 in > 100 to 200 C ... 193 



59*11, high temperature ... 194 



calibration points, standard . . . . 195 



gas-mercury, formulae, comparisons 192-194 



hydrogen 1 6Hi, o to 100 C . . 192 



i6in, 59 _ 5 to 



35 C 192 



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 ^ . . . 256 



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 

 atmospheric . . . .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 150 



Tuning forks, temperature coefficients 149 



Ultimate strengths of materials, see Mechanical. 



properties 74~99 



