970 



SUBJECT INDEX 



Constant: 

 attenuation - (see Coefficients, absorp- 

 tion) 

 dissipation -, 485 

 gravitational -, 85, 86, 87, 139, 140, 



393-395, 797 

 instrument -, 178-179, 192-198 

 spring -, 99, 100, 124, 449, 581, 582, 

 591, 595, 920 

 Construction materials, location of, 54, 



58, 60, 434, 435 



Contact metamorphism and contact 



metamorphic zones, 4, 6, 16, 50, 



51, 297, 317, 318, 385, 412, 414, 417 



Contact resistance, 642, 643, 753 



Contacts, formation - •{see Formation 



boundaries and Faults) 

 Continuous profiling, 25, 570 

 Contrasts of rock properties on formation 

 boundaries {see Formation bound- 

 aries) 

 Convergence recorder, 928-930, 933 

 Copper : 

 arsenic -, 803 



damping resistance of -, 482 

 density of -, 77 



- deposits, 50, 51, 52, 70, 73, 74 

 resistivity of -, 659 



- sulfate, 630, 667, 701 

 Corona (see Halo) 

 Core: 



- analysis, 835 



- orientation, magnetic, 35, 685, 866 

 Coring: 



electrical -, 8, 28, 33, 34, 41, 44, 45, 

 623, 625, 744, 825-840, 843 



mechanical -, 47 

 Corrections: 



amplitude -, 10, 98, 99, 117, 118 



auxiliary magnet -, 330, 333, 338, 339 



base -, 17, 332, 338, 339, 372, 373 



Bouguer -, 11, 136, 137, 141, 147 



buoyancy -, 118 



cartographic -, 226, 227 



chronometer -, 116, 117 



coast effect -, 241, 242 



diurnal variation -, 18, 162, 367-372 



drift -, 135 



elevation -,11, 25, 136-137, 375, 509, 

 572, 578 



flexure -, 10, 119-122 



free-air -,11, 136, 137 



- for normal values, 11, 14, 18, 141, 



210-212, 377 

 planetary -(latitude) -, 11, 14, 18, 94- 



97, 141, 210, 212, 375, 376 

 regional -, 141, 160, 162, 240, 241, 



246, 251, 377 

 spread -, 23, 558-560 

 temperature -, 10, 17, 118, 133, 134, 



196, 197, 327, 328, 331, 337, 366, 367 

 terrain -, 11, 14, 71, 137-140, 169, 213- 



240, 375, 376 



Corrections {cont'd): 



topographic - (see Terrain and Eleva- 

 tion correction) 



- for variation in air pressure, 10, 



118, 133 



- for variations in gravity, 162, 166, 326 



- for vertical intensity variations, 336, 



337 

 weathering -, 24, 548-549, 569, 571, 

 572, 576 

 Correlation: 



- of depth temperature curves, 34 



- of electrical logs, 33, 825, 836, 837 



- of resistivity profiles, 736, 738 



- shooting, 25, 570, 578, 579 

 Corrosion, 6, 26, 38, 41, 42, 63, 372, 624, 



631, 667, 668, 676, 679-681, 752, 

 754, 755 

 Corundum, density of, 79 

 Cost of geophysical work, 5, 47, 48 

 Coulomb's balance, 303 

 Coulomb's friction, 582, 583 

 Coulomb's law, 16, 145, 293 

 Covellite : 



density of -, 78 



resistivity of -, 657 

 Cretaceous formations : 



specific acoustic resistance of -, 479 



vertical velocities in -, 473 

 Crevices (see Faults and Fissures) 

 Critical : 



- angle, 508, 519, 522-535, 538, 539, 



541, 542, 546, 547, 557 



- damping {see Damping, critical) 

 Crocoite, density of, 77 



Crooked holes, 862, 863, 960 



Cryolite, density of, 78 



Crystalline rocks (see Igneous rocks and 



Basement rocks) 

 Cuprite, density of, 77 

 Curie : 



- point, 317 



- unit, 873 



Curie - Ch^n^veau balance, 303 

 Current: 

 alternating - (see Alternating current) 



- concentration, 31, 32, 766, 767, 769, 



790, 791, 801 



- density, 26, 630, 633, 640, 673, 674, 



683, 685, 697-699, 767-769 

 direct - (see Direct current) 



- lines, 681-684 



natural - (see Spontaneous potential) 

 Curvatures: 



- of interference fringes, 460 



- of niveau surfaces of gravity, 12-15, 



167, 169, 170-172, 174, 176, 190, 

 191, 210-212, 247 

 Curvature values, 12-15, 166, 168-170, 

 172, 174-178, 184, 186, 187, 189, 

 190, 193-195, 198-206, 203-213, 215- 

 217, 219, 220, 222-226, 228-231, 233, 

 235-238, 242-248, 251-270, 273, 276, 



