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 ri7 



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, T, 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 . 170-17 1 



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 I54-I55 



in atmosphere . . .157 



mercury 151 



salt solutions 152 



various 147-155 



Probable errors 56-59 



Probability tables 56-59 



Purkinje's phenomenon 180 



Quartz libers, 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 fornmla 251 



transmissibihty of atmosphere to 181, 182 



Radii of gyration 67 



Radio-activity 337-341 



Radium 337-341 



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 



gases and vapors . . .193 



glass 184 



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 



Rontgen 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 



