SUBJECT INDEX 



995 



SUt: 



density of -, 74 



resistivity of -, 664 

 Silver: 



damping resistance of -, 482 



density of -, 73, 77 



- ore, 50 

 Sine galvanometer, 365, 366 

 Sine (deflection) method, 349, 364, 365 

 Skin effect, 681, 685, 686, 757, 758, 801, 811 

 Slabs: 



magnetic anomalies of -, 397 



torsion balance anomalies of -, 256, 257 

 Slate: 



conductive -, 659, 660, 705 



density of -, 81 



graphitic -, 678 



heat conductivity of -, 849 



longitudinal wave velocity of -, 472 



magnetic -, 50, 419 



radioactivity of -, 875 



resistivity of -, 659-661 



specific heat of -, 848 



susceptibility of -, 312 

 Slope : 



electrical (surface potential) effect of 

 -, 722, 748-749 



gravity anomaly of -, 151, 153 



noiagnetic effect of -, 376, 397 



seismic effect of -, 521-533, 538, 547, 

 562-568 



torsion balance anomalies of -, 259, 

 260, 261 

 Smaltite, density of, 77 

 Smithsonite, density of, 78 

 Snell's law, 504, 533, 541 

 Snow, density of, 79 

 Soapstone, 55 

 Sodium chloride, 26, 638 

 Soil: 



acidity of -, 680 



density of -, 82, 83 



dielectric constant of -, 666, 667 



longitudinal wave velocity of -, 468 



radioactivity of -, 874 



specific acoustic resistance of -, 479 



specific heat of -, 848 

 Soil air, radioactivity of, 874 

 Soil analysis, 5, 35, 45, 47, 885-910 



operation of -, 900 

 Soil condenser, 649-651 

 Soil gas (see Gas) 

 Soil-resistivity bridge, 646, 647 

 Soil-testing methods (dynamic), opera- 

 tion of, 921-923 

 Soil wax {see Wax) 

 Solar tides, 163, 164 

 Solution deposits: 



autogenetic -, 49, 51 



heterogenetic -, 49, 50 

 Solution pressure, 26, 629, 630, 668 



Sound: 

 absorption of -, 935, 936, 943, 958 

 directed transmission of -, 937, 945, 

 946, 949 



- frequencies (see Acoustic frequen- 



cies) 



- intensity, 477-481 

 propagation of -, abnormal, 936, 942 



- range in: 

 air, 936, 937 

 earth, 957-958, 960 

 water, 940, 944, 945, 951 



- ranging, 9, 36, 37, 41, 42, 59, 63, 64, 



940-942, 949, 950, 960 



- receivers, 937, 938, 947-950, 953-956, 



959, 960 

 reflection of -, 867, 943, 944, 952, 957, 



962, 963 

 refraction of -, 943, 944, 957, 963 

 shot-instant transmission by -, 494, 503 



- transmitters, 936, 937, 945-947, 949, 



950, 952-956, 958 



- velocity in: 



air, 867, 935, 940, 941, 943 

 earth, 468-472, 956 

 water, 943, 944, 949, 950 

 Sour dirt, 886, 887 

 Southern hemisphere, 211, 212, 293, 295, 



412, 416, 418-420 

 Soxhlet extractor, 901 

 Space wave, radio, 651, 652 

 Spectrograph, mass, 898 

 Specular hematite (see Hematite, specu- 

 lar) 

 Specularite (see Hematite, specular) 

 Sphalerite (zincblende, zinc sulfide): 

 density of -, 74, 78 



- deposits, 52, 804 

 dielectric constant of -, 666 

 resistivity of -, 657, 659 



Sphere : 



displacement of equipotential lines 

 by -, 697-700 



gravity anomaly of -, 146 



magnetic anomaly of -, 390, 391, 392 



resistivity anomaly of -, 723 



self -potential of -, 672-674 



torsion balance anomaly of -, 254-256 

 Spinel, density of, 78 

 Spontaneous : 



- polarization (see Spontaneous po- 



tential) 



- polarization method (see Self-poten- 



tial method) 



- potential, 26, 33, 619, 621, 623, 624, 



628-631, 667, 668, 676-681, 825, 

 831-839, 869 

 Spring : 



- constant, 99, 100, 124, 449, 461, 581, 



582, 591, 595, 596 



- sediments, 875 



- water, 60, 61, 875, 881, 883, 884 

 Stakes (see Electrode, search) 



