The standardising circuit may be checked xw the constancy of working current, anytime during the measurements by simply throwing the switch S back to calibrate position. This potentiometer is provided with a double throw switch which allows the connection of either the standard cell or the unknown emf to be applied to the working circuit. The moving arm of middle dial carries two arms spaced two studs apart. This is essential so that once the instrument has been calibrated on x 1 range, calibration of the x 0. The standardisation of potentilmeter potentiometer is checked again by returning the switch S to the calibrate position. The slide-wire type of potentiometer described in the previous article is not a practical form of construction. Crompton Potentiometer complete setup for physics experiment.
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