Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 Fig. 24a. Fig. 24.— ratio arm bridges. -Series ratio arm bridge. Fig. 24ft.—Parallel ratio arm bridge. d. RATIO COMPENSATORS The potential ratiometers used by the Imperial Geophysical Ex- perimental Survey in Australia are very similar in design to the Swedish American bridge just described. A schematized view of their bridge is given in Figure 19 a. It is seen that this bridge differs from the Racom type only by the fact that condensers are u
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 Fig. 24a. Fig. 24.— ratio arm bridges. -Series ratio arm bridge. Fig. 24ft.—Parallel ratio arm bridge. d. RATIO COMPENSATORS The potential ratiometers used by the Imperial Geophysical Ex- perimental Survey in Australia are very similar in design to the Swedish American bridge just described. A schematized view of their bridge is given in Figure 19 a. It is seen that this bridge differs from the Racom type only by the fact that condensers are used instead of inductances for the determination of phase shifts. The wiring dia- grams for a series and a parallel ratio arm bridge are shown in Figure 24. Figure 25 gives a view of the panel of one of these bridges. An amplifier is also used in conjunction with these bridges, and in the field is carried by means of straps on the operator's back. For details 466
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