SUBJECT INDEX 



991 



Realgar, density of, 78 

 Rebound observations, 463-464 

 Receivers: 

 acoustic - (see Sound receivers) 

 seismic - (see Detectors, seismic) 



- in electromagnetic methods, 31, 32, 



763, 765, 778-786 

 sound - (see Sound receivers) 

 radio - (see Radio receivers) 



Record, seismic (see Seismogram) 



Recording: 



- echo sounder, 943, 950, 954, 956 



- gravimeters, 164 



- magnetometers, 18, 41, 42, 332, 366, 



370 



- pendulum, 102, 105-107, 109, 110, 



113, 115 



- seismographs, 20, 21, 41, 42, 503, 581, 



591, 598, 599, 607, 608, 610-616, 

 912, 917 



- sound-ranging devices, 940, 941 



- strain gauges, 41, 42, 929-931, 933 



- torsion balance, 14, 86, 177, 193, 



194 199 

 -well-logging devices, 34, 827, 828, 

 843, 844, 864, 867, 869 

 Red beds, 736, 738 

 Reef, 51, 419, 420 

 Reference : 



- coil, 784 



- lead, 695, 696, 759, 760, 781 



- level, 136 



- pendulum, 106 



- signal, 760 



- transformer, 695, 696, 781, 783 

 Reflection, seismic, and seismic reflec- 

 tion method, 7, 8, 20, 23, 24, 35, 

 40, 43-48, 53, 61, 437, 440, 441, 

 450-452, 478-480, 484, 486, 488-490, 

 492, 493, 505, 549-579, 862, 921, 963 



average velocity determinations in -, 



23, 568-569 

 calculations in -, 23, 572, 576-579 



- on dipping beds, 562-568 



- equipment, 20, 21, 551-556 

 field practice in -, 25, 569-576 



- on horizontal beds, 557-561 

 Reflection factor, 478, 711-716, 718-722, 



726-732, 745-749, 813 

 Reflection of radio waves, 812, 817, 818 

 Reflection of sound waves, 867, 935, 



942-944, 951-957, 962, 963 

 Refraction, seismic, and seismic refrac- 

 tion method, 4, 7, 8, 20-24, 35, 40, 

 43-46, 48, 53, 55, 58, 61, 437, 440, 

 441, 450-452, 475, 478, 480, 487, 

 489, 493, 504-549, 550, 551, 568, 

 862, 863, 921, 940, 963 

 arc mapping in - (see also Fan shoot- 

 ing), 546-548 

 curved-ray interpretation in -, 23, 540- 

 546 



Refraction (cont'd) : 



- for dipping beds, 521-523 



- for horizontal beds, 506-514 

 method of differences in -, 23, 648-549 



- for steps and domes, 514-5^ 

 vertical-ray interpretation in -, 533- 



536 

 wave-front interpretation in -, 536-540 

 Refraction of equipotential lines, 700 

 Refractive index, 480 

 Regional: 



- gradient, 240, 241, 246, 251, 262, 281 



- gravity variation, 141, 160, 162, 281 



- magnetic field, 377 

 Relaxation time, 585, 586 

 Reluctance: 



- detector (see Seismograph) 

 magnetic - (see Magnetic reluctance) 



Reluctivity (see Magnetic reluctivity) 

 Remanent magnetization (see Mag- 

 netization, remanent) 

 Residual magnetism (see Magnetism, 



residual) 

 Resistance : 

 acoustic -, 477-479, 947, 959 

 contact - (see Contact resistance) 



- coupled amplifier, 21, 552, 780, 882 

 freezing -, 485, 486 



-, resistor, rheostat, 300, 360, 361, 

 456, 494-495, 600, 633, 634, 636, 

 639, 642-648, 650, 670, 671, 683, 

 693, 708, 723-725, 745, 752, 753, 760, 

 761, 774, 779, 780, 785, 824, 825, 

 827, 843, 844, 850, 868, 893, 930, 

 931 938 



seismic'-, 62, 918, 919 



- thermometer, 843, 844, 850 

 water -, 485, 486 



Resistivity: 

 apparent -, 28, 642, 708, 715-744, 756, 



828-830, 835-839 

 determination of -, 642-649 



- by A.C. methods, 645-648 



- by D.C. methods, 643-645 



- by high-frequency methods, 648, 

 649 



- of igneous and metamorphic rocks, 



660, 661 



- of impregnations, 659, 660 



- mapping, 28, 625, 708, 825 



- methods, 25, 28, 29, 39, 45, 53, 55, 



60-63, 621-623, 625, 707-744, 761, 825 

 electrode arrangements in -, 709-711 

 equipment for -, 723-726 

 interpretation in -, 727-735 

 procedure in -, 723-726 

 results of -, 735-744 

 theory of -, 711-723 



- of minerals, 657, 658 



- of oil formations, 665-830, 831, 835- 



839 



- of ores, 659 



- of rocks, 4, 642-649, 656-665 



