SUBJECT INDEX 



993 



Sandstone (cont'd): 

 beat conductivity of -, 849 

 longitudinal wave velocity of -, 470 

 radioactivity of -, 875 

 resistivity of -, 637, 662, 663 

 specific heat of -, 848 

 susceptibility of -, 312, 424 



Sapper, detection of, 9, 64, 956, 961 



Sassoline, density of, 78 



Saturation current, 873, 880, 881 



Saturation effect, 622, 698, 707 



Saugus formation, 424 



Sawtran method, 761 



Scaffold, 7, 19, 20, 41, 407, 408 



Scale factor (see also Model experi- 

 ments), 800 



Scale value and sensitivity: 



- of electroscopes, 876-879, 881 



- of galvanometers, 601, 603, 617, 



670, 780, 841 



- of gravimeters, 11, 125-127, 130, 



131, 134, 135 



- of magnetometers, 17, 300, 322, 323, 



325-330, 335-338, 341, 344, 345, 

 353, 367 



- of pendulums, 10, 99, 100, 101, 104 



- of radio methods and apparatus, 814, 



822 



- of seismometers (see Magnification) 



- of thermometers, 841, 844 



- of torsion balances, 13, 172, 198-199 

 Scattering (see Seismic waves, scattering 



of) 

 Schist: 

 density of -, 81 

 dielectric constant of -, 666 

 longitudinal wave velocity of -, 472 

 resistivity of -, 660 

 susceptibility of -, 312 

 Schmidt balance (see Magnetometer, 



Schmidt) 

 Sea, measurements at, 41, 101, 107, 109, 



365, 945-956 

 Sea level, reduction to (see also Bouguer 



reduction), 136 

 Search coil (see Coil, reception) 

 Search electrode (see Electrode, search) 

 Secondary electrodes (see Electrode, 



search) 

 Secular variation: 



- of gravity field, 165 



- of magnetic field, 370, 372 

 Sedimentary : 



- formations, 16, 19, 43, 46, 55, 74-76, 



278, 280, 283-285, 296, 312, 316, 

 318, 389, 409, 410, 419-427, 429, 

 430, 439, 441, 474-476, 508, 512, 518, 

 520, 540, 547, 551, 677, 678, 706, 

 736, 738, 740, 743, 772, 805, 833, 

 836, 846, 847-849, 851, 862, 875, 

 904, 906, 908, 909, 929, 960 



- iron ores, 51, 52, 414 



- ores, 439 



- rocks (see Sediments) 



Sedimentation: 

 effect of -, on gravity, 165 



- and subsidence, 929 

 Sedimentation deposits, 49, 51, 52 

 Sediments and sedimentary rocks: 



cl&iStfic — 4T4 



density of -, 74-77, 82-84, 278, 280, 



283-285 

 factors affecting elastic properties 



of -,474, 475 

 longitudinal wave velocities of -, 



468-471, 474-476 

 magnetic properties of -, 16, 19, 43, 46, 



55, 296, 312, 316, 318, 389, 419-426, 



865 

 radioactivities of -, 864, 874, 875 

 Rayleigh wave velocity of -, 473 

 resistivities of -, 637, 661-665 

 specific acoustic resistances of -, 479 

 specific heats of -, 848 

 thermal conductivities of -, 847-849, 



852 

 Seismic: 



- arc mapping, 546-548 



- detector (see Seismograph and De- 



tector) 



- equipment, 20, 21, 503, 504, 505, 551- 



555, 616-618, 862, 912, 915-917 



- fan shooting, 499-504 



- instruments (see also Seismograph) 



20, 21, 503-505, 551-555, 579-61«, 

 862, 912, 915-917 



- intensity, 477-481, 497, 498 



- interpretation: 



curved ray -, 540-546, 560, 565 



- in fan shooting, 499-502 



- in reflection shooting, 557-567, 

 572-579 



- in refraction shooting, 505-549 

 vertical-ray -, 533-536 

 wave-front -, 536-540 



- methods, 7, 8, 19, 437-618, 910-928 

 method of differences, 23, 548, 549, 



572, 576 

 operation of -, 489, 490, 498-505, 514, 

 522, 525, 546, 548-551, 555, 568- 

 576, 615-618 



- records, 22-24, 451 573-575, 913, 923 



- reflection methods (see also Re- 



flection), 479-618 



- refraction methods (see also Re- 



fraction), 549-579 



- resistance, 62, 918, 919 



- unrest, 913 

 waves : 



absorption of - Csee Absorption) 

 dispersion of -, 480 497, 921, 927 

 longitudinal - (see longitudinal 



waves) 

 reflection of - (see Reflection) 

 refraction of - (see Refraction) 

 scattering of -, 479, 480 

 spreading of -, 479, 480 

 transverse - (see Transverse waves) 



