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absolute measurements accuracy of 0.01 adjustable alternating current alternating voltage ammeter ampere apparatus applied auxiliary Bureau of Standards calibration capacitance computed connected in series current and voltage current transformer decade dial deflection derived dial difference direct current direct voltage ductance effects electrical measurements electrical units electrode electrometer electromotive force electrostatic error fixed coils flux fundamental galvanometer high-voltage inductor insulated kc/s laboratories Magnetic Units magnetomotive force meas measurement of resistance ment method mutual inductance National Bureau National Physical Laboratory nominal normal number of turns percent permeameters phase angle potentiometer power factor procedure range ratio and phase relative scale secondary windings shielded resistor shown in figure shunt standard cell standard resistors standard transformers standard volt box submitted for test test set total resistance trans transfer instrument transfer wattmeter usually voltage circuit voltage divider voltmeter watthour meter zero