996 



SUBJECT INDEX 



Static magnification (see Magnification, 

 static) 



- methods of measuring gravity (see 



Gravimeter) 

 Station factor, seismic, 913 

 Steel, damping resistance of, 482 

 Steel objects, effects of, 332, 333, 373- 



375, 404, 425 

 Step outs in seismic records, 567, 668 

 Stethoscope, 948, 959 

 Stibnite: 

 density of -, 78 

 resistivity of -, 657 

 Storms, magnetic, 570 

 Strain and stress relations, 442-447 

 Strain gauges, 454-456, 928-934 

 carbon -, 930-931 

 electrical -, 456, 930-933 

 inductance -, 932, 933 

 mechanical -, 454, 929, 930 

 optical -, 455-457, 930 

 , telemeter -, 930, 931 



ultramicrometer -, 931-932 

 Strain gauging, 9, 36, 41, 42, 58, 62, 911, 



928-934 

 Strain recorder (see Strain gauge) 

 Stratification and physical anisotropy 



(see Anisotropy) 

 Stratified ground, investigations of, 20, 

 22, 28, 32, 44, 53, 60, 61, 150, 416, 

 417, 419, 437, 476, 621, 622, 624, 



625, 626, 699, 700, 707, 738, 740, 

 744, 747, 748, 751, 774, 790-800, 

 804-806, 828-837, 852 



Stratigraphic : 

 investigations (see Stratified ground) 



- traps, 907 



- variations (shallow) (see Near-sur- 



face interference) 

 Stresses: 



mechanical -, 16, 442-447 



normal -, 443-445 



shearing -, 446, 447 



tangential -, 446, 447 



ultimate -, 918, 919 



units of measurement of -, 452, 453 

 Stringers : 



magnetic -, 376, 404, 414 



self-potential anomalies of -, 676, 677 

 String galvanometer, 359, 609, 610, 613 

 Stringocephalus lime, 772 

 Stroboscopic coincidence method, 104- 



106 

 Structural studies : 



- by electromagnetic methods, 623, 



626, 771-773, 791-800, 804-806 



- by equipotential-line methods, 624, 



706 



- by gravity methods, 70, 158-161, 



290-292 



- by self-potential methods, 678 



Structural studies (cont'd): 



- by torsion balance, 70, 273-288, 



290-292 

 -by well logging, 804-806, 836, 837, 

 853, 864 

 Subaqueous (see Underwater) 

 Subdrift topography (see Bedrock depth 



determination) 

 Submarine: 

 detection of -, 9, 41, 59, 64, 949, 950-952 

 measurements in -, 41, 42, 101, 107, 

 109, 947, 949, 951 



- signaling, 484, 945-949 



- transmitter, 484, 945-947 

 Subsidence, 36, 63, 914, 928-930, 933 

 Substitution method, 644, 646, 650, 651 

 Subsurface bodies (see Geologic bodies) 

 Suess balance, 193, 194, 201 



Sulfide: 

 nickel -, 52 



- ores, 4, 8, 34, 35, 50-52, 162, 417, 



624-626, 632, 642, 668, 675, 704, 705, 

 739, 802-804, 809, 817 

 resistivity of -, 657 

 zinc - (see Sphalerite) 

 Sulfur: 

 density of -, 79 



- deposits, 53, 70, 740 

 dielectric constant of -, 665 

 resistivity of -, 658 



Sun: 



effect of -, on gravitational field, 

 162-164 



magnetic field of -, 317 

 Sundial, 346 



Superdip, Hotchkiss, 17, 342-344, 379, 430 

 Surface anomalies (see Near-surface 



interference) 

 Susceptibility: 



electric -, 640 



magnetic - (see Magnetic suscep- 

 tibility) 

 Suspension : 



bifilar -, 11, 130, 131 



gimbal -, 102, 103, 110, 352 



- of torsion balance, 175, 184, 186, 



187, 196-198 



trifilar -, 11, 128, 131, 132 



Zoellner -, 191, 192, 580 

 Swedish mining compass (see Compass) 

 Syenite: 



density of - 80 



dielectric constant of -, 666 



magnetic anomalies of -, 417 



radioactivity of -, 874 



resistivity of -, 660, 661 



specific heat of -, 848 

 Syenite-porphyry : 



coercive force and remanent magne- 

 tization of -, 316 



susceptibility of -, 313 

 Sylvanite, density of, 77 



