AN ELECTRICAL RECORDING MAGNETOMETER

Abstract

An instrument for recording at a fixed station variations in three orthogonal components of the earth's magnetic field is described. The sensitive head, containing detectors of the saturated transformer type, can be operated out of doors at the end of a long cable. A strip-chart recording meter provides a visible record of the three d-c. output signals (1 volt = 100 gammas). Calibrated baseline controls permit biasing of the magnetic detectors for any location in Canada. Tests on 10 instruments indicate a noise level of 3 gammas and a maximum drift of 10 gammas in 10 hours.