300 



INDEX. 



Resistance (see also Conductivity), electric. 



of alloys 251-253, 256, 257 



of electrolytes 259 



of glass and porcelain 270 



of metals and metallic wires 254-257 



of wires, effect of elongation on 258 



Rigidity, modulus defined 74 



of metals 74 



variation of, with temperature 76 



Rotation, magneto-optic 284-291 



Saturation values, magnetic, for steel 279 



Seconds pendulum, length of 104, 105 



Secondary batteries 247 



Sections of wires 44~54> 58-68 



Sheet metal, weight of 56, 57 



Soaring of planes, data for 109 



Solar constant 177 



Solar spectrum, wave-length in 172 



Solids, compressibility and bulk moduli of . . .83 



density of 85 



magneto-optic rotation in 284 



Solution, contraction produced by 131-134 



Solutions, aqueous, boiling-points of 196 



density of 90 



magneto-optic rotation in 288-290 



refractive indices for . '. 188 



specific heat of 224 



Sound, velocity of, in air 99 



in gases and liquids 101 



in solids 100 



Specific electrical resistance, conversion fac- 

 tors for 23, 254-256 



Specific gravity (see also Density). 



of aqueous ethyl alcohol 96 



methyl alcohol 97 



of gases 89 



Specific heat of air 223 



of gases and vapors 224 



of metals 296 



of solids and liquids 294, 295 



of water 223 



of water, formulae for 222 



Specific inductive capacity 263-265 



viscosity, aqueous solutions 144 



oils 137 



water 1 36 



Spectra, wave-lengths in arc and solar 172 



Standard cells 247 



wave-lengths of light 172 



Standards, photometric 176 



Steel, physical properties of 71 



Steam, properties of saturated 237 



Steinmetz, constants for hysteresis of 281 



Stone, strength of 70 



thermal conductivity of 197 



dielectric 244 



Strength of materials 70-73 



Stress, conversion factors for 19, 22 



Surface-tension, constants of 128, 129 



conversion factors for 20, 22 



Sylvine, refractive index of 182 



Temperature, conversion factors for 25 



critical, of gases 200 



Terrestrial magnetism, agonic lines 117 



declination, data for maximum east at 



various stations 1 18 



dip and its secular variation for differ- 

 ent latitudes and longitudes 1 1 1 



Terrestrial magnetism (continued). 



horizontal intensity and its secular varia- 

 tion for different latitudes and longi- 

 tudes 112 



secular variation of declination . . . . 1 13-116 



Thermal conductivities 197, 198 



relation to electrical 271 



expansion, coefficients of 214-218 



units, dynamic equivalent of 219 



Thermoelectricity .248-250 



Thermometer 228-233 



air 228, 231 



correction of, for mercury in stem 232 



hydrogen 231 



mercury in glass 229 



zero change due to heating 229 



zero, change of, with time 230 



Timber, strength of 70 



Time, unit of, defined xvii 



Times, conversion factors for 14 



Transformers, permeability of 



iron in 274, 275, 280, 282 



Units of measurement xv 



dimension formulae for dynamic xviii 



electric and magnetic xxv 



electromagnetic xxix 



electrostatic xxvi 



fundamental .2 



heat xxiii 



practical, legalization of electric xxxiii 



ratio of electrostatic to electromagnetic 



243 



United States weights and measures in 

 metric 9 



Vapor, density of aqueous 155 



diffusion of 149 



pressure of 1 26, 225-227 



pressure of aqueous 151-154 



values of 0.378 e 160 



pressure of, for aqueous solutions 194 



refractive indices for 190 



specific heats of 224 



Vaporization, latent heat of 204 



Velocity, angular and linear, conversion fac- 

 tors for 15 



of light 176, 243 



of sound 99, 101 



Verdet's constants for alcoholic solution of 



salts 290 



aqueous solutions of salts 287 



gases 291 



hydrochloric acid solutions of salts 290 



liquids and solids 285-287 



and Kundt's constants 292 



Viscosity, coefficient, definition of 136 



coefficient of, for aqueous alcohol 137 



for gases 1 46 



for liquids 1 38 



temperature effect on, for liquids 139 



specific, for oils 137 



for water 1 36 



Volumes, conversion factors for 12 



critical, of gases 200 



Water, boiling-point for various barometric 



pressures 170, 171 



density of 9 2 ~94 



specific heat of 222, 223 



