INDEX 



667 



PAGE 



Geophysical data 569-574 



Geopotential 561 



German silver, mechanical properties 121 



Giant stars 623-624 



Gilbert 397 



Glare sensitivity of eye 331 



Glass: absorption of gases (I. C. T., 3, 251) 

 X rays (I. C. T., 6, 20) 



dispersion 356-358 



Fresnel reflection formula 376 



indices of refraction 356-359 



Jena, temperature variation 359 



permeability to gases (I. C. T., 5, 76) 



reflection of light by 376 



refraction indices 356-359 



resistance, electric; temp, variation 419 



transmission of 386-388 



vessels, volume of 108 



viscosity at high temperatures 656 



Glycerol-water viscosities 206 



Gold, mechanical properties 124 



Gradient, earth's thermal 569 



Gram-centimeter (g • ergs) unit of work 659 



-molecule 659 



Grating space calcit e 91, 96 



Gravitation, acceleration of: anomalous 567 



f(lat.. alt.) 564 



United States stations. 566 



world stations 565 



constant, 666.4 x 10- 10 dyne • cm 2 • g- 2 , 



definition 75, 659 



Gravity, specific (see also density) 158-179 



Gudermanians 41-46 



Gyration, radii of 72 



h. 6.547X io -27 erg • sec 94~99 



powers of 103 



h/c, powers of 103 



H atom mass, i.66x io -24 g 105 



, radius Bohr orbit 106 



Hall magnetic effect 482 



definition 463 



Hardness: (see also mechanical properties) ..110 et seq. 



Brinell no 



elements 137 



scleroscope no 



various no et seq. 137 



Harmonics: cylindrical (Bessel) 68-70 



roots 70 



sound 193 



zonal spherical 66, 67 



Harvard spectrum classification (stellar) 617 



Heat: adsorption, molecular (colloidal) 554 



atomic, of elements 289 



tungsten 321 



capacities 285-288 



combination 3 1 1-3 1 2 



combustion: carbon compounds 307 



coals 308 



explosives 309-3 1 o 



gases 308 



liquid fuels 308 



woods 308 



conduction: air spaces, across 327 



alloys 272 



bad conductors 276 



diffusivities 277 



Fourier 279 



gases 277 



high temperatures 273, 328 



insulators 274-275 



liquids, f (pressure) 277-278 



metals 272 



miscellaneous 273 



resistance to, Fourier 279 



salt solutions 276 



temperature, high 273, 3-28 



content of tungsten, f(t) 321 



convection losses of, in air 327, 329 



diffusivities 277 



dilution of, H 2 S0 4 312 



dimensional formulae xxxvi 



dissociation of, for molecules 512 



electrical equivalent of 86, 87 



formation of 31 1-3 r 2 



, ions 312 



Ra and emanations 52s 



PAGE 



Heat: fusion, latent, of (I. C. T. 4, 9; 4, 172; 5, 



130) 294 



alloys and metals (I. C T., 



2, 458) 



elemei.cs (I. C. T., 1, 103) 288 



index (stars) 602 



latent, of fusion 294 



elements 288 



vaporization: ammonia 306 



elements 294 



formulae 296 



steam... 297, 298 et seq. 



various liquids .... 295 



mechanical equivalent of 86 



neutralization, H0SO4 312 



specific: (general) 290 et seq. 



alloys 290 



ammonia 291 



atomic constant 106 



electricity 401 



elements 285, 289 



gases, also Cp/C'v 293 



liquids 291 



mercury 290 



minerals, rocks 292 



silicates 292 



solids 290 



vapors 293 



water 290 



treatment of steels u 2 



Hefner unit 334, 659 



Heights, barometric determination of 188 



boiling point of water, determination of . . . 189 



dynamic 561 



geometric 561 



Henry 659 



Hertzian wave lengths 515 



Heterochromatic sensitivity of eye 331 



Horizon, dip of 602 



Horizontal intensity, terrestrial magnetism: 



annual change, H 579 



f(lat., long.) U. S., 1925 593 



isodynamic world chart 577 



secular change, U. S., 1885-1925.. 593 



Horsepower to foot-pounds 251, 659 



Humidity : (general) 234-235 



constant, maintenance of air at (I. C. T., 



1. 67; 3. 385) 179 



relative 236-238 



term density of moist air 177-179 



Hund's Bohr spectra notation 504 



quantum numbers 504 



Hydrogen atom, Bohr orbit 106 



doublet constant 107 



electron speed 106 



mass, i.66xio _24 g 105 



series 495 



thermometer 249 



Hydrolysis, ammonium acetate 438 



Hydrostatic pressures, Hg and H 2 columns 180 



Hyperbolic functions, natural and logarithmic 41-46 



Hysteresis 463, 473 



transformer steels 472 



Ice: allotropic modifications 253 



freezing point, pressure effects 253 



point on thermodynamic scale 85-86, 103 



Ignition temperatures, gas mixtures 310 



Incandescent filaments, heat losses 329 



oxides, brightness 336 



Inclination, magnetic: f(lat., long.), U. S., 1925. 592 



I (or dip): annual change.. 579 



isoclinic lines, world chart.. 576 



isoporic " " " ■ • 578 



secular change, U. S 592 



Index, color (stars) 602 



heat " 602 



of refraction: air, 76 cm, 15° C 374 



alums 362 



crystals: (see also 



minerals) 367-370 



biaxial: miscel- 

 laneous . 37o 

 negative . . 368 

 positive . . . 367 

 monorefringent 



(isotropic) 363 



