SUBJECT INDEX 



1195 



Torsion balance (continued) 



observations, corrections for, 330-336 



optical system, 320 



photographic plates, reading of, 325 



regional effects on, 348-351, 364-367 



simple structures, effects on, 352-360 



surveys: 



examples of, 361-367 



terrain corrections for, 331-339 



theory, 304-319 



with inclined beams, 303 



Z-beam, 303 

 Topographic camera, 393 

 Topographic correction for gravity, 403 

 Total resistance logging method, 1018-1024 

 Transverse resistivity, 515 

 Transient (electrical) methods, 549, 554 

 Traps: 



miscellaneous, 33 



stratigraphic, 33 



structural, 33 

 Travel-time curve: 



for direct wave, 667, 670 



for reflected waves, 066-671 



for refracted waves, 641, 648, 668, 669, 751- 

 764 



in seismology, 64, 649 

 Traverse waves {see also Seismic waves), 640, 

 641, 646 



Love, 640 



Rayleigh, 640, 662 



reflected {see Reflection) 



refracted {see Refracted) 



velocity of, 658 

 Trespass practice, 1146-1151 

 Truman gravimeter, 373, 374 

 Tubing collar reflections, 1127-1129 



u 



Up-hole shooting, 718-720, 737 

 Uranium, 991, 992 



V 



Vacquier balance, 101 

 Vacuum Tube Voltmeter, 539 

 Variable-area recording camera, 823 

 Variable-area reproducer, 823 



Variable reluctance seismometer, 796-801 

 Variometers, 95 



Vectors, anomalous, ISO, 206, 214-218 

 Velocity depth function, 681-683 

 Velocity shooting, 728 



reflection method, 728, 729 



refraction method, 729-731 



well surveying method, 731-733 



low velocity zone {see Low velocity layer), 

 714-716 



Velocity type seismometer, 780 

 Vertical coil energizing method, 620-625 

 Vertical coil energizing (electromagnetic) 



method, 620-625 

 Vertical footage, 1082 

 Vertical formations, 226 

 Vertical intensity {see Magnetic) 

 Vibrating-reed electrometer, 1002, 1004 

 Volcanic formation, 226 

 Volt-ammeter electrical method, 533-535 

 Von Sterneck-Askania pendulum, 277 



w 



Water covered areas {see Offshore operations), 



17, 18 

 Water location methods, 1072, 1073 



correlation of oil well waters, 1076, 1077 



photoelectric method, 1075, 1076 



resistivity methods, 1073 



self-potential method. 1073, 1074 



thermometric method, 1074 

 Water shooting, 900 

 Water supply engineering, 55 



choice of methods, 56 



prospecting (electrical), 560 

 Wave front chart, 685, 686 

 Weathered layer {see Low velocity layer) 

 Well-logging {see Bore-hole investigations) 

 Wenner electrode configuration, 489-491, 517, 



518 

 Wright gravimeter, 378 



Z-beam torsion balance, 303 

 "Zero Length" spring, 377 



