INDEX. 



353 



Minerals, specific heats of 242 



Mixtures, freezing 230 



Moduli of elasticity: rigidity 71 



Young's 72 



Molecular conductivities: equivalent . . 305-308 

 specific . . . 301-304 



Molecular magnitudes 342 



Molecules per cu. cm. gas 342 



Moments of inertia 67 



Monthly temperature means 183 



Moon's light and radiation no 



Musical scales 103 



Nernst thermo-magnetic difference of potential . 334 

 Neutral points, thermo-electric .... 268-269 



Newton's rings and scale of colors 204 



Nickel: Kerr's constants for 331 



magnetic properties of, at 100 C . . .321 



resistance in magnetic field 333 



Nitroso-dimethyl-aniline, refractive index . .186 



Numbers atomic 336 



Nutation 109 



Observatories, magnetic, elements 117 



Ohm, various determinations of 272 



legal value 272 



Oils, viscosity of 128 



Organic compounds, boiling-points . . . 223-224 



densities 223-224 



melting-points . . . 223-224 

 Oscillation constant, wireless telegraphy . . . 298 



Parallax: solar; lunar 109 



Parallax: stellar no 



Peltier effect 268, 271 



Pendulum, length of seconds 107 



Periodic system of the elements 343 



Permeabilities, magnetic . . . 315-317, 320-321 

 Phosphorescence from radio-active bodies . .337 



Photometric standards 178 



Pi, IT, value of 12 



Planck's radiation formula 251 



Plane, data for the soaring of a 125 



Planetary data no 



Planets, miscellaneous data no 



Platinum resistance thermometer ..... 247 



Poisson's ratio 73 



Polarized light: by reflection 197 



by metallic reflection .... 195 



rotation by magnetic field 326-331 



solutions .... 203 



Potential difference: cells: double fluid . . .263 

 secondary .... 263 

 single fluid .... 262 

 standard . . . 261, 263 



storage 263 



contact: liquid-liquid . . 264 



liquid-salt . . . 264 



metal-liquid . . 267 



solid-solid . . .266 



sparking: air ... 294-295 



kerosene . . . 296 



various .... 296 



thermoelectric . . . 268-271 



Precession 109 



Pressure: barometric measures . . . . 119-123 

 barometric and boiling water . 170-171 



heights 169 



mercury columns, due to 118 



water columns, " 118 



wind 124 



Pressure effect on melting-points 221 



solubility 143 



Pressure, vapor: alcohol, ethyl and methyl . . 149 



aqueous 154-155 



in atmosphere . . . T57 



mercury 151 



salt solutions 152 



various 147-155 



Probable errors 56-59 



Probability tables 56-59 



Purkinje's phenomenon 180 



Quartz fibers, strength of 68 



refractive index of . 187 



specific heat 240 



Radiation: black-body 251 



constants of 251 



cooling by, and convection . . 252-253 

 eye, sensitiveness of, to 180 



Radiation: Planck's formula 251 



resistance, wireless telegraphy . . 300 

 sensitiveness of the eye to . . . .180 



" solar constant " of 181 



solar, monthly change 183 



Stefan's formula 251 



transmissibility of atmosphere to 181, 182 



Radii of gyration 67 



Radio-activity 337-341 



Radium 337~34i 



Radium emanation 337-341 



Radio-active equilibrium 337 



Reflection of light: by metals . . . 195, 196, 198 

 terms of "" and "" .197 

 various substances . .198 



Refraction, indices of: alums 187 



crystals .... 185-190 

 fluorite 186 



glass 



Iceland spar 186 



liquids 192 



metals 195-196 



monorefringent solids . 188 

 nitroso-dimethyl-aniline . 186 



quartz 187 



rock-salt 185 



salt solutions . . . .191 



silvine 185 



solids, isotropic . . . .188 



Relative humidity 160 



Resistance: see also Conductivity. 



alloys, low temperature .... 280 

 alternating current, effect of ... 297 



aluminum 284 



copper 284 



electrolytic, see Conductivity. 



glass and porcelain 282 



legal unit of 272 



magnetic field, of bismuth in . 333 



metals in . 333 



nickel in . 333 



metals at low temperatures . 280 



ohm, various determinations of 272 



platinum, thermometer 247 



radiation, wireless telegraphy . . 300 



specific: metals 274-276 



wires 273,286-293 



temperature variation 276, 280, 282, 285 



Rigidity, modulus of 71 



temperature variation . .71 



Ring correction (magnetization) 317 



Rock-salt, indices of refraction 185 



Rods, demagnetizing factors for 323 



Rdntgen rays 335-336 



ray spectra 336 



Rotation of polarized light: by solutions . . . 203 



Rotation, magneto-optic: formulae 326 



gases 330 



Kerr's constant . .331 



liquids 328 



solids 327 



solutions 329 



Verdet's constant 326-330 

 Rowland's standard wave-lengths 173 



Salts, lowering of freezing-point by 227 



raising " boiling- " 229 



Saturation, magnetic, for steel 321 



Scales, musical 103 



Screens, color 201-202 



Seconds pendulum 107 



Secondary batteries 263 



Sections of wires 283 



Shearing tests of timber 69-70 



Sheet metal, weights of 89 



Silica glass specific heats 240 



Silver, electro-chemical equivalent . . . 261, 301 



Silvine, indices of refraction 185 



Sines, natural and logarithmic, circular . . 32-40 



hyperbolic . . 41-47 



Sky-light, comparison with sunlight .... 182 



Soaring of planes, data for . 125 



Solar constant of radiation 181 



distance from earth 109 



energy, data of 181-183 



motion no 



parallax 109 



radiation monthly change 183 



spectrum 181, 183 



temperature 181 



