SUBJECT INDEX 



979 



Gravimeter {cont'd) : 

 Gulf -, 127 

 Haalck -, 124 

 Hart Brown -130 

 Hartley -, 126 

 Humble -, 132 

 Ising -, 129 



Lindblad-Malmquist -, 125, 126 

 Mott-Smith -, 133, 134 

 natural frequency of-, 127 

 recording -, 165 



- results in mining, 161, 162 

 scale value of -, 134 

 sensitivity of -, 134 



- survey results, 157-162 

 Threlfall and Pollock -, 125 

 Thyssen -, 132, 133 

 trifilar-, 131, 132 

 Truman -, 132 

 unastatized -, 124-126 

 underwater -, 109 

 Wright -, 125 



Gravimetric methods, 7-15, 67-292 

 Gravitation, principles of, 88-97 

 Gravitational : 



- constant, 85-87, 139, 140, 797 



- exploration {see - methods) 

 -field, 11-16, 67, 88-96 



time variations of -, 162-167 

 -methods, 7, 8, 9-15, 67-292 



- pressure, 75, 476 

 Gravity : 



acceleration of -, 88, 89, 454 



- anomalies : 



regional-, 141, 142, 160 

 local -, 145-162 



- attraction of: 

 cylinder, 146-150 

 sectors, 149 

 two-dimensional bodies, 150-154 



- calculation from gradients, 248-250 



- change with elevation, 135-137, 190 



- change with latitude, 141, 211 



- compensator, 87-89 

 corrections on -, 135-143 



- field, 3, 9-16, 67, 88-96 



- gradient, 10, 13-15, 70, 170, 171, 



175-179, 182, 184, 186, 187, 189-195, 

 199, 201-203, 206, 210, 211, 213, 215, 

 218, 220, 222, 226-230, 231, 233-236, 

 238, 240, 244-266, 269, 270-292, 

 394-397, 400 

 graphical representation of-, 244-248 

 Gravity : 



horizontal components of, 12, 39, 157, 

 167-169, 171, 172, 174-176, 253, 254, 

 394 



international formula for -, 97 



- interpretation, 143-157 

 analytical -, 146-153 

 direct -, 143, 144 

 graphical -, 153, 154 

 indirect -, 143, 144 

 integraph methods, 154r-157 



Gravity {cont'd) : 



isostatic correction for -, 141 



- meter {see Gravimeter) 



- methods (see Gravitational methods) 



- multiplicator, 88 

 normal -, 141 



- pendulum, 10, 97-123, 135 

 planetary correction of -, 141, 211 

 regional -, 141, 142, 160 

 secular variation of -, 165 

 -terrain correction, 137-140 

 time variations of -, 162-167 



- variation with latitude, 94-97, 141, 



211 

 Gray seismograph, 580 

 Gray wacke : 



density of -, 81 



elastic moduli of -, 467 

 Greenstone, resistivity of, 661 

 Ground-distance meter {see Terrain- 

 clearance indicator) 

 Ground roll, 450, 452, 550, 551 

 Ground water {see Water, ground) 

 Grueneisen method, 455, 456 

 Guillemin effect, 317 

 Gypsum : 



density of -, 79 



-deposits, 51, 54, 736, 738 



dielectric constant of -, 665 



elastic moduli of -, 464 



heat conductivity of -, 848 



longitudinal wave velocity of -, 470, 

 471 



radioactivity of -, 875 



resistivity of -, 663 



specific heat of -, 848 



susceptibility of-, 312 



H 



Half-value point, 382, 387, 393, 673, 698 



- time, 877 

 Halides, 901, 903 



resistivity of -, 658 

 Halleflinta, density of, 81 

 Halo, 36, 903-910 



Harbor investigations, 57, 58, 738 

 Harbor surveillance, 951 

 Hardness, 464 

 Hartley oscillator, 931 

 Heat {see also Temperature) : 



- conductivity (see Thermal con- 



ductivity) 

 specific -, 847, 848 

 Helium, 873 

 Helmholtz coil, 330, 331, 333, 338, 348, 



363, 366, 403 



- with uniform field, 363 

 Helmholtz resonator, 938, 940 

 Hematite : 



density of -, 78 



- deposits and mineral, 51, 52, 297, 



318, 414, 415, 417, 520 

 dielectric constant of -, 666 



