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A Double Percentage Bridge

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Abstract

Description. This instrument is essentially a double bridge supplied with two slide wires which are used in equalizing the ratio coils. The resistance of the ratio coils bears such a relation to that of the slide wires that the ratio coils may be used as the auxiliary coils in a percentage bridge.

Advantages. In addition to simplifying the process of equalizing the ratio coils, this device offers a simple and exact method of balancing the bridge without shunting either of the standards or resorting to the rather unsatisfactory method of interpreting galvanometer deflections.

Some suggestions are given concerning details of construction.

© 1926 Optical Society of America

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