984 



SUBJECT INDEX 



Magnetite (cont'd): 



resistivity of -, 657, 659 



spontaneous polarization of -, 668 



susceptibility of-, 311 

 Magnetism of rocks, 4, 16. 19, 297-318 



determination of -, 300 309 



factors affecting -, 314 318 



- and geologic history, 315, 318 

 induced -, 296, 297, 299-301, 306, 307, 



309, 382, 389, 390, 392-394, 400, 

 401, 402, 865 



- and mechanical forces, 317, 318 



- and mineral composition, 314, 315 



- and temperature, 317 

 Magnetization: 



intensity of, 298-300, 307, 317, 318, 



382, 387, 390, 393, 394,401,402 

 remanent -, 16, 19, 296, 297, 299-301, 

 303, 306, 307, 309, 315-317, 382, 

 400^02, 865 

 Magnetomechanics, 317, 318 

 Magnetometer : 

 Ambronn -, 341 

 Angenheister -, 342 



astatic -, 301, 302, 303, 359, 364, 865, 866 

 Cardan suspension -, 352, 353, 422 

 Dahlblom pocket -, 348, 349 

 earth inductor type -, 358-363 

 fundamental equation of -, 321 

 Haalck universal -, 339, 340, 341 

 horizontal -, 17, 301, 306, 318, 334-339, 



340, 341, 349, 350, 351, 352 

 Hotchkiss superdip -, 17, 342, 343, 344 

 Koenigsberger -, 342 

 Kohlrausch -, 349, 350 

 Koulomzine -, 342 

 operation of, 332, 333, 338, 339, 373 

 Ostermeier -, 342 ' 

 Ostermeier universal -, 351, 352 

 prospecting -, 321-355 

 Rieber -, 364 



Schmidt compensation -, 350, 351 

 Schmidt horizontal -, 17, 318, 334, 339 



auxiliary magnets, effect of, 336 



gravity, effect of, 337 



misorientation of -, 335 



operation of -, 338, 339 



scale value of -, 335 



tem.perature, effect of, 337 



theory of -, 335 



tilt, effect of, 336 



vertical intensity, effect of, 336, 337 

 Schmidt vertical -, 17, 18, 40, 48, 301, 

 318, 321-333, 405 



auxiliary magnets, effect of, 325, 326 



gravity, effect of, 326 



instrument case, magnetic effects 

 of, 373 



instrument constants and correc- 

 tions, 328-332 



misorientation of -, 323 



operation of -, 333 



scale value of -, 323 



temperature, effect of, 326, 327, 328 



Magnetometer (cont'd) : 

 theory of -, 321-328 

 tilt, effect of, 323, 325 

 Thalen-Tiberg -, 349, 402, 405 

 Thomson-Thal6n -, 347, 348 

 Toepfer -, 342 

 uninlar - , 301 



vertical -, 17, 18, 40, 48, 301, 318, 321- 

 333, 341, 342, 347, 348, 351, 352, 

 353, 361, 364, 366 

 Watt- 342 



Wilson attachment for -, 352 

 Magnetomotive force, 297, 298, 595, 



596 

 Magnetostriction: 



- effect on rock magnetism, 317 



- transmitters and receivers, 946, 947, 



948, 952, 953, 955, 956 

 Magnetron, 353, 354 

 Magnification: 



dynamic -, 481, 587, 588, 589, 603, 604, 

 605, 606, 618 



static -, 581, 586, 587, 588, 589, 593, 

 594, 595, 596, 598, 601, 602, 606, 

 615, 617, 912, 917, 919 

 Malachite: 



density of -, 78 



susceptibility of -, 310 

 Manganese, 51, 52, 73, 421 

 Manganite, density of, 78 

 Manometer, 119, 899, 900 

 Marble : 



density of -, 81 



dielectric constant of -, 666 



heat conductivity of -, 849 

 Marine-acoustic methods, 943-956 

 Marine gravity apparatus, 101-103, 107, 



109 

 Markasite: 



density of -, 78 



resistivity of -, 657 



susceptibility of -, 310 

 Marl ; 



density of -, 81 



longitudinal wave velocity of -, 469 



resistivity of -, 637, 663 

 Martens gauge, 454, 930 

 Mass-absorption coefficient, 873, 881 

 Mass displacements, effect on gravity, 



167 

 Mass spectrograph, 898 

 Maxwell (unit), 297-299 

 May sandstone, 706 

 McKittrick formation, 424 

 McLeod gauge, 899 

 Measurement procedures in geophysical 



exploration, 38-42 

 Mechanical concentration: 



- deposits, 49, 51, 416 



effect of -, on rock magnetism, 318 

 Mechanical seismographs (see Seismo- 

 graphs, mechanical) 

 Megabar, 452-454 

 Megger, 644, 645, 723, 724, 725 



