988 



SUBJECT INDEX 



Pendulum (cont'd) : 

 quartz -, 10, 108, 118 

 reference -, 103 

 reversible -, 99 



- rods, 108 



- survey results, 157-162 

 suspended -, 99, 100 



time transmission -, 10, 103-116 



Vening Meinesz -, 109-110 

 Penetrating radiation (see Gamma ra- 

 diation) 

 Pennsylvanian, vertical velocities in, 473 

 Peridotite: 



density of -, 80 



- plugs, 56, 418 

 susceptibility of -, 313, 314 



Period: 



- of gravimeter, 124, 125, 127, 130, 



132, 134 



- of ground motion, 449, 452, 586 



- of pendulum, 10, 97-104, 117-119, 



121, 122, 135 



- of seismograph, 581, 583, 585, 586, 



591. 



- of torsion balance, 86, 178, 195-197 

 Periodic motion, 449 



Permeability : 



- for liquids and gases, 743, 835, 836, 



869, 902, 904, 905 



magnetic- (see Magnetic permeability) 

 Permeation, 904, 905 

 Permian, vertical velocities in, 473 

 Petroleum (see also Oil): 



composition of -, 890 



density of -, 79 



dielectric constant of -, 665 



heat conductivity of -, 848 

 Petrologic composition (see Mineral 



composition) 

 Phantom horizon, 579 

 Pharmacosiderite, density of, 78 

 Phase : 



- of ground motion, 449 



- logs (seismic), 576, 577 



- shifts, phase differences: 



- in directional hearing, 938-939, 

 942, 948, 949, 953, 961 



- of elastic and dissipative moduli, 483 



- in electrical prospecting, 28, 31, 

 32, 622, 624-626, 639, 640, 649, 

 650-654, 686-688, 691, 692, 695, 

 696, 702, 752, 753, 764, 766, 769, 

 779, 784-793, 803, 804, 806, 807, 810 



- of ground and seismograph, 587- 

 590, 618 



- of ground and vibrator, 915, 916, 

 920-922 



- of pendulum, 107 



- of temperature variation, 861 



- speed, 921, 923, 925-927 

 Phlogopite : 



elastic moduli of -, 467 

 susceptibility of -, 310 



Phone (see Geophone and Seismograph) 

 Phonolite, density of, 81 

 Phosgenite, density of, 77 

 Phosphate, 54 



density of -, 79 

 Photoelastic studies, 934 

 Photoelectric cell, 112, 113, 115, 116, 366, 

 869, 954, 955 



- well logging, 869 

 Photographic recording (see Recording) 

 Phyllite: 



density of -, 81 



heat conductivity of -, 849 



susceptibility of -, 312 



Physical properties of rocks (see Rock 

 properties) 



Pickup (see Detector) 



Picrite, density of, 81 



Pipe leaks, 6, 9, 61, 64, 866, 868, 956, 

 959, 961, 962 



Pipe lines: 



■ corrosion of -, 6, 26, 38, 41, 42, 63, 

 372, 624, 631, 667, 668, 676, 679, 

 680, 681, 752, 754, 755 

 location of -, 33, 57, 58, 63, 297, 436, 



624, 627, 765, 818-824 

 magnetic effects of -, 333, 373-405, 436 



Pitchblende, 35, 854, 875, 884 



Placer deposits, 5, 8, 21, 26, 49, 51, 70, 

 291, 292, 297, 318, 416, 417, 419, 

 421, 439, 501, 502, 624, 628, 667, 

 675, 677, 678, 735 



Planetary variation (see Latitude vari- 

 ation) 



Planimeter, 154, 155, 236-238, 268 



Plastic shot-hole casing, 491 



Platform (see Scaffold) 



Platinum, 50, 52, 297, 416 



Platinum wire, 197, 701 



Pleistocene to Oligocene, vertical veloci- 

 ties in, 473 



Plotting: 



- of dynamic test data, 923 



- of electrical data, 26, 670, 695, 696, 



702, 729, 733, 754, 771, 784 



- of geothermal data, 844, 845 



- of gravity data, 11, 141, 143 



- of magnetic data, 18, 19, 377-380 



- of seismic data, 21, 501, 502, 504, 



505, 509, 510, 536-538, 546, 576, 579 



- of torsion-balance data, 15, 244-250 

 Plumb-line deviations (see Vertical, 



deflection of) 

 Poisseuille coefficient, 439, 481-483, 936, 



958 

 Poisson's ratio, 439, 443-446, 449, 454, 



457-460, 463, 468, 474, 926, 927 

 Poisson's theorem, 393 

 Polar: 



- gravity, 96 



- radius, 95, 210, 212 



Polarity, magnetic, 16, 19, 296, 316, 320, 

 339, 380 



