SUBJECT INDEX 



1185 



Gravity: 



absolute measurement, 269, 273 



acceleration, 261, 263 



anomalies, Bouguer, 258, 266-268, 425, 426 



over assumed bodies, 425, 426 



over ore bodies, 426, 427 



over sedimentary structures, 429-434 



over simple geometric form, 352-354 

 Bouguer corrections, 256, 257, 402 

 curvature moment, 287-289, 315-319, 331, 



343-348 

 density, 247, 263-266, 425 



determinations, 290 



of materials of earth's crust, 264-266 



profiles, 409 

 earth's rotation, effects on, 252 

 elevation correction, 256, 402 

 Eotvos units, 285, 308 

 equipotential surface, 258, 288, 289, 292-298, 



309-315 

 force of, 248, 249 

 gradient moment, 268, 285, 286, 304-308, 330, 



343-348 

 horizontal component, 306, 307, 309-315, 



315-318 

 instruments, types of, 247 

 isanomalic contours and profiles, 349, 415 

 latitude correction, 253, 254, 255, 330, 403 

 law of (universal), 248, 249 

 mapping, residual, 415-424 



average value method, 416, 420 



profile method, 421-425 



smooth contour method, 420, 421 

 measurement units, 255, 308, 309 

 methods, 29 



comparison with magnetic methods, 247, 248 



cost of, 37 



history of, 6 

 moon, eflfects on, 249 

 Newton, law of, 248, 249, 255 

 patents, 434-436 



regional effects, corrections for, 415-424 

 sea level, corrections, 404-409 

 terrain corrections, 404-409 

 topographic corrections for, 331-339 

 variations in, 255 

 Gulf underwater gravimeter, 386, 387 

 Gun sampler, 1084-1086 



H 



Haalck gravimeter, 379 



Halliburton Company vs. Walker, 1158-1161 



Hartley gravimeter, 372, 373 



Heat flow: 



lag, velocity and wave length, 980, 981 



periodic, 978, 980 



theory of, 967, 971 

 Helicopter, 849 



Helmholtz coil, 101, 102, 131, 148 

 High frequency and radio logging method, 1023 

 Highway engineering, 59 

 Hilger and Watts magnetometer, 119, 120 



History of: 



airborne methods, 18 



chemical methods, 938, 939 



electrical, 8 



exploration of water covered areas, 17 



gravitational methods, 6 



magnetic methods, 4 



offshore areas, 17 



potential logging method, 1038 



radioactivity methods, 987 



radioactivity well logging, 1094, 1095 



seismic, 11 



seismic reflection method, 13 



seismic refraction method, 12 



slim-hole drilling, 21 



soil analysis, 17 



trends of development, 15 

 Horizontal distance chart (seismic), 690 

 Horizontal footage, 1083 

 Horizontal intensity (magnetic), 91, 92, 93, 



101-106, 109-113, 214-216 

 Horizontal loop method, 609 

 Hot wire resistance seismometer, 803 

 Hotchkiss Superdip magnetometer, 114-118 

 Hoyt gravimeter, 374, 375, 376 

 Hydraulic feed type drill, 872-878 

 Hydrocarbon analysis, {see Soil analysis) 

 Hydrocarbon well logging, 959-961 

 Hysteresis, magnetic: 



curve, 170-173, 179 



loop, 172 



Igneous rocks: 



density of, 264 



magnetic susceptibility of, 165 



resistivities of, 441 

 Ilmenite: 



density of, 264 



magnetic susceptibility of, 160-164 

 Inclination, 96 



Induction logging method, 1057-1059 

 Inductive electrical method, 602-619 

 Insurance for geophysical operations, 1151-1153 



automobile, 1153 



compensation, 1152 



public liability and property damage, 1152, 

 1153 

 Inter-locking seismic recording, 854 

 Interpretation, general, 26 

 Interval change (seismic), 739-743 

 Ionization chamber, 996, 997, 1002, 1098-1100 

 Iron ore: 



density of, 265 



magnetic susceptibility of, 163, 165 



residual, 52 



sedimentary, 51 

 Isanomalic contours and profiles, 349, 415 

 Isostasy, 260, 261 



K 



K-capture, 989 



Kohlrausch magnetometer, 158 



