980 



SUBJECT INDEX 



Hematite (cont'd): 



resistivity of -, 657, 659 



susceptibility of -, 311 



specular -, 50, 414, 415, 657 

 Hemisphere (see Northern hemisphere 



and Southern hemisphere) 

 Hettangian age, 676 

 High frequency (see Frequency, high) 

 High-frequency method, 31, 32, 619, 622, 



623, 626, 648, 805-809 

 High-frequency well-surveying, 867 

 Highway engineering (see Engineering, 



highway) 

 Hooke's law, 442, 920 

 Horizontal component: 



- of electrical field (see Electrical field) 



- of electromagnetic field (see Electro- 



magnetic field) 



- of gravity force, 12, 39, 157, 167-169, 



171, 172, 174-176, 253, 254, 394 



- of ground or building vibration, 917, 



918 



- of magnetic force (see Horizontal 



intensity) 



Horizontal directing forces (see Curva- 

 ture values) 



Horizontal intensity, magnetic, 16-18, 

 295, 301, 306,"^ 320 321, 323, 325, 

 335-341, 344-346, 349-351, 355-357, 

 360, 361, 364-366, 368, 374, 378-402, 

 406, 409, 410, 412, 417 



- determination of: 



by deflection, 356, 357 

 by oscillation, 356, 357 

 Horizontal loop methods, 626, 648, 

 774-805 

 elliptical polarization, 787-789 

 equipment, 774, 778-786 

 interpretation, 789-800 

 loop fields, 776-779 

 results, 800-806 

 Horizontal pendulum or seismometer 



(see Seismograph, horizontal) 

 Hornblende: 

 density of -, 80 

 resistivity of -, 658, 660 

 susceptibility of -, 310 

 Hornblende-gabbro, density of, 80 

 Hornsilver, density of, 77 

 Hotchkiss superdip, 175, 342-344, 379, 



430 

 Hot wire: 



- gas detector, 64, 868, 869, 892-894 



- microphone, 938, 940, 948 



- seismometer, 613 

 Hughes balance, 819, 820 

 Hughes echo sounder, 957 

 Huygens principle, 506 



Hydraulic engineering (see Engineering, 



hydraulic) 

 Hydrocarbons: 



aliphatic -, 889 



aromatic -, 889 



Hydrocarbons (cont'd) : 

 classification of -, 889 

 liquid -, 888, 891, 901-904, 909, 910 

 paraffin -, 888-892, 895, 896, 901-905 

 pseudo -, 36, 891, 899, 903, 909 

 soil analysis by -, 35, 885-910 



Hydrogen, 629, 669, 891, 894, 899, 903, 905 



Hydrogen sulfide, 886 



Hydrometer, 72 



Hydrophone, 947-951 



Hygrometer correction, 118 



Hygrometric observations, 61 



Hyperbola, 559, 560, 561, 941 



Hypersthene, density of, 78 



Hysteresis: 



- curve, 297, 299, 300, 303, 307-309, 



318, 401 

 elastic -, 442 



magneto-mechanical -, 317, 318 

 temperature -, of magnetization, 317 



I 

 Ice: 

 density of -, 79 

 dielectric constant of -, 665 

 elastic moduli of -, 467 

 heat conductivity of -, 848 

 Iceberg, locating, 9, 41, 59, 64, 952 

 Igneous intrusions (see Intrusions) 

 Igneous rocks, 4, 16, 48, 55, 61, 284, 286, 

 296, 297, 376, 389, 401. 416-419, 422, 

 424, 427, 429, 432-435, 512, 513, 

 634, 637, 638, 656, 742, 849, 870 

 coercive force and remanent mag- 

 netization of -, 316 

 densities of -, 73, 74, 76, 80, 81 

 elastic moduli of -, 467, 474, 475, 477 

 heat conductivities of -, 849 

 longitudinal wave velocities of -, 472, 



474, 475, 477 

 magnetic susceptibilities of -, 313-315 

 radioactivity of -, 870, 874, 875 

 Rayleigh wave velocities of -, 473 

 resistivities of -, 634, 637, 638, 657, 



660, 661 

 specific heats of -, 848 

 transverse wave velocities of -, 472, 473 

 Ilmenite : 

 coercive force and remanent magneti- 

 zation of-, 315 

 density of -, 78 

 resistivity of -, 657 

 susceptibility of -, 310, 314 

 Images: 



- in inductive methods, 32, 791-800 



- in radio methods, 818 



- in reflection seismic methods, 562, 567 



- in resistivity methods, 672, 711-714, 



717-719, 722, 745, 749, 751 

 Impedance bridge, 647 

 Impetus, 451 



Impregnation (see Dissemination) 

 Inclination, of formations (see Dip) 



