POTENTIOMETER, DECADE PATTERN

Eight steps of 2 ohms and a slide wire of equal resistance enclosed circular type. Divided into 200 parts and calibrated to read in milli volts, all in series and with coarse and fine rheostat provide the standadizing unit. terminals are provided for standard cell,Glavanometer and two 1.5 Volts batteries and two sets of external test circuits worked by a rotary switch.