. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 2. Electric circuits of the Susceptimeter. The switch 52 makes it possible to energize simultaneously the bridge and galvanometer field winding with 60-cycle alternating current, or 6-volt direct current, while S3 is for the purpose of connecting the galvanometer directly to the output junctions of the bridge, or including the amplifier in the in- dicator circuit. The switches 55 and S6 control the external alternating-cur- rent and direct-current power sources, respectively. Theory Let Ri and R2 be the resistances o
. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 2. Electric circuits of the Susceptimeter. The switch 52 makes it possible to energize simultaneously the bridge and galvanometer field winding with 60-cycle alternating current, or 6-volt direct current, while S3 is for the purpose of connecting the galvanometer directly to the output junctions of the bridge, or including the amplifier in the in- dicator circuit. The switches 55 and S6 control the external alternating-cur- rent and direct-current power sources, respectively. Theory Let Ri and R2 be the resistances of the ratio arms; R3 the resistance of the arm containing the inductances Lx and L2; R\ the resistance of the arm con- taining the inductances L3 and L4; then, the condition imposed for a balance with direct current is RiR3 = R2Ri varying rB a balance can be obtained for steady currents. 19
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