992 



SUBJECT INDEX 



Resistivity (cont'd). 



- of sediments, 661-664 



- sounding, 28, 625, 708 

 temperature coefficient of -, 639 



- of water, 61, 62, 631, 633, 636-638, 



658 



- in wells, 33, 34, 41, 42, 825-831, 835- 



839 

 Resolving power, 39, 40 

 Resonance : 

 electrical -, 649, 650 



- frequency ' {see Frequency, reso- 



nance) 



- radiation, 898 



- of rock specimens, 461, 462, 481, 482 



483 



- of structures and ground, 36, 911, 



918, 919, 921 



- of seismographs, 587-589 

 Response (see Frequency response) 

 Restoration coefficient, 463-464 

 Reversible pendulum, 99 

 Rhyolite, density of, 73, 81 

 Rhyolite glass, density of, 81 

 Riefler clock, 86 



Riehl6 testing machine, 457 



Rigidity, modulus of, 445-448, 460, 483, 



592, 926, 927 

 Ring induction method, 626, 648, 782, 



783, 796 

 Road beds, 57, 441, 928 



magnetic effect of -, 374 

 Road materials, 54, 58, 60, 434, 624, 742 

 Rock bursts, 914, 928, 929, 931 

 Rock density (see Density) 

 Rocking mirror devices, 454-457, 930 

 Rock properties, physical, 4, 5, 20, 41, 437 



-, contrasts on boundaries (see Forma- 

 tion boundaries) 



-, densities, 70-84 



electrical -, 628-667 



magnetic -, 297-318 



radioactivities of -, 873-878 



seismic -, 441-483 



thermal -, 848-849 

 Rock resistivity (see Resistivity) 

 Rock salt, 51, 54, 291, 292, 736, 738, 740, 

 851, 860 



density of -, 79 



dielectric constant of -, 666 



elastic moduli of -, 467 



heat conductivity of -, 848 



longitudinal wave velocity of -, 471 



resistivity of -, 658 



specific acoustic resistance of -, 479 



susceptibility of -, 310, 312 



thermal conductivity of -, 848 

 Rock saw, 642 

 Rock temperatures (see Temperatures of 



rocks) 

 Roof failure (see Mine caving) 

 Rotary drill, 20, 490, 491, 842, 899 

 Rotation of the earth, 89, 163, 367 



Rubber, damping resistance of, 479, 



482, 947 

 Rutile, density of, 78 



S 



Safety : 



- of dynamite, 485-487 

 mine - (see Mine safety) 



Saline waters, 54, 638, 658, 816, 833, 867, 



888, 929, 943 

 Salinity, 60, 869, 943 

 Salt (see Rock salt) 



Salt anticlines, 45, 158, 273, 274, 423, 736 



Salt domes, 4, 5, 8, 15, 21, 33, 35, 43-47, 



53, 54, 70, 158, 159, 275, 282, 295, 



422-425, 441, 499-501, 518, 579, 



738, 739, 805, 806, 817, 851, 852, 



860, 862, 894, 929 



acoustic measurements on -, 958 



electrical results on -, 738, 739, 805, 806 



gas and oil analysis results on -, 894, 



907, 909 

 geothermal investigations of -, 851, 



852 856 

 gravity'maxima on -, 158, 278, 281, 282 

 gravity minima on -, 158, 159, 275, 



276, 277 

 leaching of -, 929 

 magnetic results on-, 423, 424 

 pendulum and gravimeter results on -, 



158, 159 

 radio field strength measurements 



on -, 811, 817 

 seismic results on -, 275, 282, 500, 501, 



518, 579, 862 

 torsion balance results on -, 274-283, 

 291 292 

 Salt mine's, 54, 274, 291, 292, 811, 817 

 Saltpeter, density of, 79 

 Salt water (see Saline waters) 

 Sand: 

 density of -, 74, 76, 83 



- deposits, 54, 55, 742 

 dielectric constant of -, 666, 667 

 grain arrangement of -, 634-637 

 heat conductivity of -, 849 

 longitudinal wave velocity of -, 



468-470 



oil - (see Oil sand) 



porosity of -, 74, 637, 832 



radioactivity of -, 864 



resistivity of -, 637, 664, 833 



specific heat of -, 848 



susceptibility of -, 312 



water - (see Water sand) 

 Sandstone : 



coercive force and remanent magneti- 

 zation of -, 316 



density of -, 75, 83 



dielectric constant of -, 666 



elastic moduli of -, 468 



-formations, 55, 284, 285, 289, 290, 

 424, 427 



