966 



SUBJECT INDEX 



Amplifier (cont'd): 



- in Geiger counter, 864, 882, 883 



seismic -, 21, 503, 552, 553, 556, 617, 

 618, 917 

 Amplitude correction, 98, 99, 117, 118 

 Andalusite, density of, 80 

 Andesite : 



density of -, 81 



elastic moduli of -, 467 



electrical anomaly of -, 755 



heat conductivity of -, 849 



specific heat of -, 848 

 Andesite glass, density of, 81 

 Anglesite, density of, 77 

 Anhydrite, 34, 54, 291, 292 



density of -, 79, 84 



dielectric constant of -, 666 



elastic moduli of -, 468 



longitudinal wave velocity of -, 471 



susceptibility of -, 310, 312 

 Anisotropy : 



electric -, 636, 643, 693, 700, 706 

 thermal -, 848, 851-853 

 Ankerite, susceptibility of, 310 

 Annabergite, density of, 78 

 Anodic zones, 680, 681 

 Anomalies : 

 electromagnetic -, 766, 773, 790-809 

 Eltran -, 761 



equipotential-line -, 697-706 

 gravity -, 4, 12, 146-162 

 magnetic -, 4, 16, 18, 19, 296, 316, 373- 



378, 381-436 

 resistivity -, 713-744 

 self-potential -, 672-681 

 torsion balance -, 254-292 

 Anomalous vectors, 378, 379, 405-407, 

 411, 413, 417, 418 

 horizontal -, 378, 379 

 total -, 380 

 vertical -, 379, 380 

 Anorthosite, density of, 81 

 Antenna, 812, 813, 814, 815, 867 

 Anthracite: 

 density of -, 79 

 dielectric constant of -, 666 

 resistivity of -, 658 



spontaneous polarization of -, 53, 668, 

 677 

 Anticlines (domes, uplifts), 5, 8, 12, 15, 

 43, 45, 70, 151, 153, 158, 160, 161, 

 252, 259, 262, 263, 282, 283, 296, 

 396, 425, 430, 431, 441, 508, 518, 

 547, 551, 577, 736-738, 907 

 electrical logging results on -, 838 

 electrical prospecting results on -, 



735-737 

 magnetic results on -, 424, 425, 428, 429 

 pendulum and gravimeter results on -, 



157-161 

 seismic results on -, 518, 547, 577 



Anticlines (cont'd) : 



torsion balance results on -, 273, 274, 

 283, 284 

 Vntimonite, density of, 78 

 Antimony, density of, 77 

 Apatite, density of, 80 

 Aperiodic motion (see Damping, critical) 

 Apparent velocity (see Seismic wave 



velocity) 

 Approximation curves, 717, 718, 729-731 

 Aquagel, 491, 571 

 Aqueducts, 57, 58 



Aquifer (see also Water), 61, 62, 743 

 Arago gauge, 899 

 Archimedian spiral, 583 

 d'Arcy's law, 904 

 Argentite, density of, 77 

 Argillite, resistivity of, 662 

 Armorican sandstone, 706 

 Aromatic hydrocarbons, 889, 890, 900 

 Arsenides, resistivity of, 657 

 Arsenopyrite : 

 d'Arsonval galvanometer, 552 



density of -, 77 



- ore, 704 

 susceptibility of -, 310 



Artesian basins, 61 

 Asbestos, 55 

 Asphalt : 



- base oils, 888-889 

 density of -, 79 



- deposits, 886, 887 

 Aspirator, 868, 877, 881 



Astatic system, 301, 302, 303, 359, 364, 

 865, 866 

 magnetic, 367 

 Astatization: 



- of gravimeters, 11, 127, 128 



- of seismographs, 586 

 Astronomic observations, 113, 168, 169 

 Atacamite, density of, 78 

 Atmosphere, unit, 452^54 

 Atmospheric acoustic methods, 935-943 

 Atmospheric electricity, 3, 370 

 Atomic number, 871 



Atomic weight, 872 

 Attenuation (see Absorption) 

 Augite: 



density of -, 80 



dielectric constant of -, 666 



elastic moduli of -, 467 



susceptibility of -, 310 

 Augite diorite: 



coercive force and remanent magneti- 

 zation of -, 316 



density of -, 80 

 Augite syenite: 



coercive force and remanent magneti- 

 zation of -, 316 



susceptibility of -, 313 

 Austin chalk, 285 



AutocoUimation method and system, 

 177. 321, 322, 324, 930 



