SUBJECT INDEX 



1181 



Capacity seismometer, 802 

 Carbon-button seismometer, 803 

 Carbon-grain microphone, 805 

 Carbon-granule seismometer, 803 

 Carrier current systems, 805 

 Casing-head pressure, 1131 

 Cavendish torsion balance, 250 

 Cement location, 1064, 1065 

 Chemical methods, 938-965 



gas analysis {see Gas analysis), 940 



patents, 962-965 



physical principles, 939 



prospecting for ore {see Chemical prospecting 

 for ore) 



prospecting for petroleum {see Chemical pros- 

 pecting for petroleum) 



soil analysis {see Soil analysis), 943 



well logging {see Chemical well logging) 



Chemical prospecting for ore: 



dispersion halos of soils, 956-958 



indicator elements, 957 



indicator plants, 958 



plant roots, 958 



soils, 956 



surface water, 956 

 Chemical prospecting for petroleum: 



analytical technique, 944 



application, 955, 956 



cost of, 37, 955 



emanometric method, 942, 943 



gas analysis {see Gas analysis) 



history of, 938, 939 



physical principles, 939 



plotting of data, 948 



soil analysis {see Soil analysis) 

 Chemical well logging: 



and slim hole drilling, 21 



fluorologging, 961 



hydrocarbon logging, 959-961 



mud analysis logging, 961 



well cuttings, 959 

 Civil engineering, 56 



dam sites, 57, 564-568, 918-925 



highway engineering, 59 



reservoir sites, 59 

 Clay: 



density of, 266 



magnetic susceptibility of, 165 



resistivity of, 441 



velocity of, 660 

 Coal: 



density of, 265 



resistivity of, 442 

 Compass, 4, 108, 109 



declinometer, 94 



Brunton, 109 



Swedish mining, 112 



Variometer, 95 



Wilson, Brunton, 109 

 Compensation insurance, 1152 

 Composite seismic recording, 854 



Compton scattering, 991 

 Computation charts (seismic) : 



depth, 688, 689 



dip, 689, 690 



horizontal distance, 690 

 Concession land system, 1144 

 Conductive electrical methods, 582-592 

 Conglomerates, 51 



copper bearing, 52 



gold bearing, 51 

 Conklin's loop method, 609 

 Continuous profiling, 704 



Continuous wave (C.W.) location systems, 905, 

 906, 909-911 



Dacca system, 909 



Lorac system, 909, 910 



Raydist system, 910, 911 

 Cores, measurement of, 1086 

 Correlation shooting (seismic) : 



and dip shooting, 707, 708 



continuous profiling in, 737 



geological correlation, 705 



illustration of, 709 



pulse correlation, 702-704 



spot correlation, 704, 705 

 Corrosion surveys, self-potential method, 454, 

 455 



D 



Dam sites, 57 



electrical surveys of, 564-568 



seismic exploration of, 918-925 

 Damping, electromagnetic, 784-786 

 Decca system, 909 

 Density, 247, 263 



of materials of earth's crust (Table 7), 264, 

 265, 266 

 Diamagnetic materials, 63 



magnetic susceptibility of, 165 

 Dip chart (seismic), 690 

 Dip needle. 111, 112, 114-118 

 Dip shooting (seismic) : 



average dip and strike, 696 



comparison with correlation shooting, 707, 708 



computation charts, 687-690 



depth determination, 679, 680, 688, 689 



dip calculation, 674 



dip determination, 675, 676, 679, 680, 689, 690 



horizontal determination, 680, 690 



three dimensional case, 677-681 



two-component, illustration of, 690-692 



two dimensional case, 675, 676 



variations in, 735 



wave velocity {see Seismic wave velocity) 

 Dipmeter, 1077-1081 



accuracy of, 1079 

 Dipmeter survey: 



areas of application, 1080 



curve, 1080 



dip determination between wells, 1077 



equipment for, 1079 



field procedure, 1080 



