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alternating current angle anomalies apparatus axis beam body brass carried centre coil conducted conductor consists curvature deflecting magnet density depth designed determined Diagram DIP CIRCLE direction distance disturbances earth earth's magnetic field earthquake effects electrical methods electrodes employed Eotvos equipotential lines explosion point Galitzin geological geophysical methods gradients ground horizontal component inclined indicated indirect wave instrument introduced investigations knife edges located magnetic meridian magnetic method magnetic survey magnetic system magnetite magnetometer mass means measurements Microid mining compass Mintrop mirror modification motion Museum needle observations Observatory obtained oscillograph pendulum photographic plane portable position potential pyrites Rayleigh waves record resistivity rocks rotation salt domes scale Schlumberger Schweydar seismic method seismograph Seismos sensitivity shown shows spontaneous polarization stations structures subterranean surface suspended telescope Terrella time-distance curve torsion balance transverse wave traverse variation variometer velocity vertical component vertical intensity vibration wire