SUBJECT INDEX 



983 



Loops : 



horizontal -, 31, 32, 776-779, 783, 787, 

 791 793 



vertical-, 31, 32, 805, 806, 807 

 Louis dipping compass, 346 

 Love waves, 450, 451, 926 

 Low frequencies (see Frequency) 

 Lunar variation of gravity, 163, 164 



M 



Mache unit, 873, 881 , 884 

 Machine drill (see Rotary drill) 

 Maeotic formation, 837 

 Magma movements : 



effect of -, on gravity, 165 



effect of -, on magnetic anomalies, 318 

 Magmatic differentiation deposits, 49, 



50, 52, 412, 413 

 Maghesite : 



density of -, 79 



-deposits, 55 



susceptibility of -, 310 

 Magnet : 



auxiliary -, 325, 326, 330, 333, 336, 338, 

 339, 341, 347, 349, 350, 351, 373 



dipping -, 384-386, 388, 403 



= magnetic doublet, 19, 384-388, 778 

 Magnetic : 



- anomalies, 4, 16, 18, 19, 296, 316, 377, 



378, 381-402, 409-436 

 relation of-, to gravitational 

 anomalies, 393-395, 400 



- balance (see Magnetometer) 



- corrections, 366-377 

 -doublets, 19, 384-388, 778 



- field (see also Horizontal intensity. 



Total intensity, and Vertical in- 

 tensity), 16, 293, 295, 296, 298, 

 299, 302-320 

 latitude variations of -, 372 

 - of subsurface bodies, 377^02 

 time variations of -, 367, 372 



- flux (see Flux) 



- gradient, 363, 380, 406, 407 



- inclination (see Inclination) 



- instruments, 17, 18, 318-366 

 classification of -, 319 

 construction principles of -, 318, 



319 

 theory of -, 319-321 



- interpretation : 

 induction theory, 389, 400 

 pole and line theory, 381-389 

 qualitative, quantitative, 380, 381 

 theory based on both permanent and 



induced magnetism, 400^02 

 -latitude, 16, 19, 293, 295, 327, 328, 

 332, 338, 343, 369, 372, 380, 389, 

 392, 393, 394, 395, 397-399, 403, 416 

 -line, 19, 145,385 



- line doublet, 19, 385-388 



- method, 8, 15, 16-19, 43, 45, 49, 50, 



51, 52, 54, 293-436 



Magnetic (cont'd) : 



- moment, 299-303, 306, 307, 320, 321, 



323, 326-330, 335-338, 340, 341, 

 344, 345, 348, 351, 353, 365, 374, 

 390, 392, 778 



-needle, 17, 301, 302, 306, 320, 321, 



341, 343, 344, 349-351, 357, 358, 

 364, 365 



- objects,332, 333, 373, 374, 375, 404, 425 



- observatories, 366, 367, 368, 369 



- permeability, 297, 298, 299, 302, 622, 



642, 685, 757, 810, 811 



- pole (pole of magnet), 19, 115, 302, 



320, 326, 330, 336, 343, 350, 351, 

 354, 374, 375, 378, 380, 381, 384, 

 388, 389, 390, 406-408, 552, 754, 

 766, 785, 792 



- reluctance, 297, 298, 595 



- reluctivity, 298 



- rock properties (see Magnetism of 



rocks) 



- storms, 370 



- surveys, 408-436 



- in engineering, 433-436 



- in mining, 409-422 



- in oil exploration, 422-433 



- susceptibility, 16, 297, 299, 301, 302, 



303, 304, 305, 306, 307, 309, 374, 

 376, 382, 387, 390, 392, 395-402, 411, 

 414, 419, 424, 427, 432, 433, 865 

 apparent -, 390, 392 



- of igneous rocks, 313, 314 



- and magnetite content, 315 

 measurement of -: 



balance method, 303 

 ballistic method, 306, 307 

 inductive method, 303-306 

 Koenigsberger method, 301 , 302, 303 

 solenoid-deflection method, 306 

 test tube method, 301 



- of metamorphic rocks, 312 



- of minerals, 310, 311 



- of sedimentary rocks, 312 



- systems, 17, 303, 319, 320, 321, 322, 



324, 325, 334, 335, 337, 339, 340, 



342, 347, 348, 351, 352 

 temperature-compensated -, 322, 



324, 325, 327, 328, 337 



- theodolite, 355-358, 366 



- torsion balance, 303, 355, 380 



- variations, 367-372 

 diurnal -, 367-371 

 secular -, 370, 371 



- vectors, 378, 379 



- vertical intensity (see Vertical 



intensity) 

 Magnetite, 16, 50-52, 287-290, 296, 297, 

 308, 309, 314, 315, 318, 409, 411-417 



coercive force and remanent magneti- 

 zation of -, 315 



density of -, 78 



elastic moduli of -, 467 



heat conductivity of -, 848 



