SUBJECT INDEX 



981 



Inclination, magnetic, 17, 39, 40, 295, 

 343-347, 349, 355-359, 361, 362, 

 364, 368, 378-380, 393, 394. 403, 418 

 Inclinator, inclinometer: 



= dip circle and dip needle, 17, 345-347, 

 356-358, 403, 413, 415, 422, 436 



rotary - {see Earth inductor) 



Tiberg -, 349, 364 

 Incompressibility factor, 445, 446 

 Index curves, 807, 808 

 Indian magnetometer, 358 

 Indicator length, 581, 582 

 Inductance bridge, 305, 306, 932, 933 

 Inductance function, 758 

 Induction : 



- balance, 819-822 



- factor, 792-797 

 -instruments (magnetic), 364, 365 



- theory in magnetic interpretation, 



19, 389^00 

 Inductive electromagnetic methods (see 

 Electromagnetic methods, induc- 

 tive) 

 In-phase component {see Electromag- 

 netic field) 

 Instruments: 

 gravity measuring - {see Pendulum 



and Gravimeter) 

 magnetic - {see Magnetometer) 

 rock testing - {see Density; Magnet- 

 ism; Susceptibility; Elastic mod- 

 uli; Resistivity; Dielectric con- 

 stant; Radioactivity; and Thermal 

 conductivity, determination of) 

 Integraph, 144, 154, 156, 157, 236, 238, 



239, 249, 253, 268, 269, 270, 400 

 Intensity: 

 acoustic - {see Acoustic intensity) 



- of electrical field (see Electrical field) 



- of electromagnetic field (see Electro- 



magnetic field) 



- of gravity {see Gravity field) 

 magnetic - (see Total intensity. 



Vertical intensity, and Horizontal 

 intensity) 



- of radioactive radiation (see Radio- 



active radiations) 

 seismic - (see Seismic intensity) 

 Interferometer, 120, 455-457, 460, 930 

 Interior friction, 118, 481, 583, 922, 936 

 Interpretation : 

 analytical methods of -, 144, 146-153, 



255-265, 381, 400, 728, 766-769, 



790-791 

 -diagrams, 144, 150, 154-156, 256, 



258, 263-268, 388, 400, 537-539, 



544, 546, 558-560, 565, 566, 726, 727, 



733, 768-769, 793-795 

 direct -, 19-23, 26, 28, 31, 32, 67, 143, 



256, 260, 263-265, 382, 384, 385, 



387, 437, 623, 673, 727-733, 793, 885 

 -of electromagnetic surveys, 31, 32, 



766-777, 789-800 

 -of equipotential line surveys, 28, 



697-703 



Interpretation {cont'd): 

 graphical methods of -, 144, 153-154, 

 253, 256, 265-268, 389, 400, 536-539, 

 729, 733, 768-769, 793-795 



- of gravimeter surveys, 11, 67, 143-157 

 indirect -, 11, 15, 143, 144, 253, 388, 



389, 395-400, 623, 671, 766-769. 

 integraph methods of -, 144, 154-157, 

 253, 268-270, 400 



- of magnetic results, 19, 293, 377-402 



- by models (see Model experiments) 



- of pendulum results, 11, 67, 143-157 



- of potential-drop-ratio measure- 



ments, 29, 747-751 

 qualitative -, 11, 15, 19, 26, 28, 31, 143, 

 250, 380, 623, 697, 727-728, 766 



- of resistivity surveys, 726-734 



-of seismic results, 20-25, 506-549, 

 557-567, 572, 576-579 



- of Belf-potential surveys, 26, 671-675 



- of soil and gas analvsis data, 36, 



902-909 



- of torsion-balance results, 15, 143, 



250-270 



- by type curves, 29, 252, 383-387, 623, 



671, 731-733, 734, 767, 790, 791 

 Intrusions, 4, 8, 15, 19, 45, 51, 70, 297, 



315, 381, 417-419, 421, 422, 427, 



429, 430, 432, 433, 435, 514 

 Ion, 369, 629-633, 637, 639, 679, 874, 882, 



884, 898 



- concentration, 629-631, 637 

 -mobility, 631, 637, 639 



Ionization, 637, 872, 873, 878, 898 



- chamber, 35, 865, 872, 876-881, 884 

 Iridescent films, 886 



Iron : 



- chloride, 303 



- objects, 332, 333, 373-375, 404, 425 



- ore, 4, 8, 16, 51, 70, 73, 74, 287, 296, 



318, 376, 385, 389, 401^15, 884 

 coercive force and remanent mag- 

 netization of -, 315 

 density of -, 73 

 susceptibility of -, 311, 401, 411 



- quartzite, 287, 409-411 

 susceptibility of-, 312, 411 



Ironstone, density of, 83 



Isanomalics, 18, 19, 378 



Isochronous pendulum, 101 



Isochrons, 476, 548 



Isogam, 11, 18, 141, 142, 158-161, 170, 



244, 248-252, 272, 279. 

 Isogeothermal surfaces, 845, 852-854, 



860, 861 

 Isomagnetic lines (see Isanomalics) 

 Isomers, 891, 901 

 Isometric representation, 378 

 Isostatic : 

 -compensation, 165 



- correction, 141 

 -equilibrium, 165 



Isothermal (see Isogeothermal) 

 Isotime curves, 476, 548 



