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Post Office Box (Dial Type)

Post Office Box, Dial Type :

(ZES 242)

Two decade having ratio of the bridge consists of four coils each, to give ratio arms of 0.001, 0.01, 1, 10, 100, 1000. Four decade resistance units total 11,110 ohms. The coils of constantan wire double silk covered are wound non-inductively and mounted on the stems of the dial studs with a ball click device to ensure correct location., the brushes are of laminated phosphor-bronze, with rare contact areas to give a low and constant dial contact resistance. Two terminals are provided for using the four decade resistance units as a four dial decade resistance box. Two enclosed type tapping keys for battery and galvanometer. Terminals for connections of unknown resistance, battery and galvanometer. Accuracy of 0.1% on coils above 1 ohm, 0.05% on unit coils.

 
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