982 



SUBJECT INDEX 



Jadeite, density of, 81 

 Jolly balance, 72 

 measurements of vertical gravity 

 gradient by -, 190, 191 

 Joule effect, 947 

 Jurassic formations, 81, 291, 703, 706 



K 



Kainite, density of, 79 



Kaolin, density of, 79 



Kaolinite, density of, 79 



Keewatin formation, 703 



Kelvin balance, 303 



Kelvin theorem, 845, 846 



Kennelly-Heaviside layer, 936 



Keratophyre, coercive force and rema- 

 nent magnetization of -, 316 



Keuper formation, 290 



Kew magnetometer, 358 



Kieserite, density of, 78 



Kilohm-centimeter, 633 



Kirchhoff's law, 717 



Kirchhoff-Wheatstone bridge, 363 



Kundelungu formation, Belgian Congo, 

 678, 679 



Laccolith, 428, 433 

 Lakes : 

 electrical measurements on-, 764, 



802, 803 

 gravimeter measurements on -, 162 

 torsion balance measurements on-, 

 270-275 

 Lam6 coefficients, 439, 445-448 

 Lamont sine method, 349, 364, 365 

 Landolt-Bornstein tables, 310 

 Langevin-Florisson transmitter, 947 

 Laplace's equation, 89, 169, 191 

 Larsen compensator, 30, 781, 782 

 Latitude variation: 



- of curvatures of earth ellipsoid, 211, 



212 



- of curvature values, 211, 212 



- of gravity, 94-97, 141, 211 



- of gravity gradient, 210, 211 



- of magnetic anomalies, 393, 394, 



397-399 



- of magnetic field components, 372 



- of magnetic variations, 368, 369 

 Lava: 



density of -, 73, 81 



- flows, 297, 317, 318, 416, 419, 434, 435 

 heat conductivity of -, 849 

 radioactivity of -, 874 

 resistivity of -, 661 

 susceptibility of -, 849 



Layered media (see Stratified ground) 



Lead: 

 damping resistance of -, 482 



- deposits, 70, 73, 74 



- for ionization chambers, 881 

 Leads, power {see Power leads) 

 Lead-zinc deposits, 50, 289, 417, 705 

 Leakage (see Pipe leaks) 



Lecher system, 648 



Lejay-Holweck pendulum (see Pendu- 

 lum) 

 Lemniscate, 687, 688, 691 

 Lenticular oil deposits, 45, 47, 422, 433 

 Leptite formation, 162, 703, 704 

 Leucite, density of, 80 

 Level surface (see Equipotential surface) 

 Leveling, 137, 213, 239, 571 

 Lightning, 309, 315, 316, 376 

 Light velocity, 685, 810, 811, 940 

 Lignite, 51, 53, 70, 289, 290, 739, 740, 

 773, 886 



density of -,79 

 Limestone : 



density of -, 76, 84 



dielectric constant of -, 666 



elastic moduli of -, 468, 474, 475 



- formations, 46, 51, 54, 61, 76, 284, 



285, 286, 289, 414, 441, 474, 475, 



508, 518, 520, 547, 637, 677, 728, 729, 



735, 736, 738, 741, 833 

 heat conductivity of -, 849 

 longitudinal wave velocity of -, 470, 



471 

 radioactivity of -, 875 

 Rayleigh wave velocity of -, 473 

 resistivity of -, 637, 660, 663, 836 

 specific acoustic resistance of -, 479 

 susceptibility of -, 312 

 transverse wave velocity of -, 473 

 Limonite: 

 density of -, 78 

 dielectric constant of -, 666 



- niineral, 51, 318, 415, 417, 630, 668 

 resistivity of -, 657 

 susceptibility of-, 311 



Lines of force (diagram), 389 



Liquid hydrocarbons (see Hydrocarbons) 



Listening devices (see Sound receivers) 



Lithographic stone, 55 



Loam: 



density of -, 82 



dielectric constant of -, 666, 667 



longitudinal wave velocity of -, 468 



specific heat of -, 848 

 Loess : 



density of -, 82 



elastic moduli of -, 468 



longitudinal wave velocity of -, 468 



Rayleigh wave velocity of -, 473 

 Logarithmic decrement, 585, 586, 815 

 Longitudinal wave, 447, 448-452, 464, 

 466, 468-477, 498-502, 504-551, 

 536-569, 849, 862, 863, 866, 914 

 Loop galvanometer, 359, 609, 893 



