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A Geophysical Abstracts 140 JanuaryMarch 1950 nos 1167911907
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America Bull amplifier amplitude anomalies apparatus assignor borehole Bouguer Bouguer anomalies circuit Claims allowed coil components comprising computed connected core corporation of Delaware counter crust curves density depth detecting detector determined direct current earth earthquakes elastic electrical electrical resistivity electrode electromagnetic equations exploration geophysics fluid formations frequency gamma rays Geofis geoid Geol Geological Survey geomagnetic Geophys gradient gravimetric gravity indicate instrument intensity investigations ionization isostatic issued km./sec layer logging magnetic field magnetite magnetometer maps means measurements meters method mgal microseisms minerals neutron Observatory observed obtained Okla output pendulum Petroleum phase potential produced profiles prospecting pulses radiation radioactivity recording reference ellipsoid refraction region resistivity rocks rotating samples seismic refraction seismic waves seismograph seismological signal stations structure surface telluric currents temperature thickness tion torsion balance tube Tulsa U. S. patent values variations velocity vertical vibrations voltage