SUBJECT INDEX 



971 



Curvature values (cont'd) : 



277, 280. 284, 286-289, 291, 292, 

 394-396, 400 

 graphical representation of -, 244-250 

 integration of -, 39, 168, 169 

 Curvature variometer: 



- Brillouin, 292 



- Eotvos, 13, 14, 175, 176, 178, 193 

 Curved-ray method, 23, 540-546, 560 

 Cuyuna formation. Wis., 415 

 Cyclodiolefins, 889 

 Cycloolefins, 889 

 Cycloparaffins, 889 



Cyclotron, 354, 355 



Cylinder : 

 gravity attraction of -, 146-150 

 magnetic anomalies of -, 392, 396 

 torsion balance anomalies of -, 258, 

 259, 261 



D 



Dacian formation, 836, 837 

 Dacite, density of, 81 

 Dahlblom: 



- magnetometer, 348, 352 



- sine arm, 349, 352 

 Dam: 



- investigations, 6, 57, 58, 435, 441, 



624, 733, 734, 741, 742, 928, 930 



- sites, 8, 57, 58, 60, 435, 928, 930 

 Damping: 



air -, 583 

 antenna -, 815 



- constant, 481, 584 



critical -, 584, 585, 587, 588, 590, 603, 



604, 605, 606 

 determination of -, 481, 616, 617, 



921 

 electromagnetic -, 584 



- of electromagnetic waves, 649, 685, 



811 



- factor, 586 



- of ground, 911, 921 

 oil -, 583 



- ratio, 585, 586, 588 



relative -, 481, 482, 586-590, 602, 606, 

 607, 921 



- resistance, 482, 584 



- rocks, 481, 482, 483 



- of structures, 36, 911, 912, 918, 



919 

 d'Arcy's law, 904 

 Darley pipe locator, 765, 818, 819 

 Decibel, 480 

 Declination, magnetic, 39, 40, 295, 355, 



356, 361 

 Declinator, 356, 357 

 De Collongue deflector, 349, 351 

 Decomposition (see Disintegration) 

 Deep: 



- sea sediments, 874, 875 



- wells, 840, 841, 845, 862, 863, 866, 



867, 868 



Deflection: 



- of galvanometer, 304-307, 598-601, 



644 



- of gravimeter, 124, 128-131, 133 



- of magnetometer, 300, 301, 303, 306, 



321, 323, 326, 335, 336, 340, 344, 

 345, 348-351, 353, 356, 357, 364, 365 



- of pendulum, 97-100, 581 



- of rock specimen, 459, 461 



- of seismograph, 581-588, 591, 593- 



596, 616 

 sine method of -, 349, 364, 365 

 tangent methods of -, 349, 365 



- of torsion balance, 177, 178 



- of the vertical (plumb-line devi- 



ation), 70, 167-170 

 Deflectometer (see also Strain gauges), 



454-456 

 Deflector, de Collongue (see also Magnet 



and Compensator), 351 

 Deformation, elastic, 441-449 

 Del Rio formation, 285 

 Demagnetizing: 



- effect of A.C. fields, 328, 372, 373 



- factor, 306, 390, 393, 395, 401, 402 



- influence of disintegration, 318 



- influence of gaps, 315 

 Density, 4, 10, 15, 16, 67 



bulk -, 74, 75, 77 



- change with depth, 75, 76 



- of combustible minerals, 79 

 determination of -, 70-72 



buoyancy method, 72 

 flotation method, 72 

 pyknometer method, 71 

 by weighing, 71 

 factors affecting -, 72-77 



- of igneous rocks, 73, 80, 81 



- of metallic minerals, 77-79 



- of metamorphic rocks, 81 



- of miscellaneous materials, 79 

 mineral -, 74 



natural -, 76, 77 



- of ore bodies, 73 



- of rocks, 70 



- of sedimentary rocks, 82-84 

 Deposits, mineral, 49-51 

 Depth: 



- of burial, 74-76, 474^76 



- calculations and determinations, 7, 



11, 15, 19, 22, 23, 25, 26, 28, 29, 

 31, 32, 143, 144, 148-157, 251-270, 

 382, 384, 387, 407, 408, 439, 504, 

 508-515, 524, 525, 529-533, 538, 542, 

 544-548, 560, 572, 576-579, 671, 673, 

 728-734, 747, 754, 756, 766, 767, 

 790, 793, 794, 799, 807, 812, 818, 

 835, 837, 856, 867, 885, 905, 925, 

 951-956, 963 



- control, 8, 67, 293, 437, 621, 671, 708 



- of crystallisation, effect on elastic 



properties, 474 



