Description

Plug type, High-resistance Constantan coils mounted on a bakelite panel. Three plug arms for P (ratio arm), Q (ratio arm), and R (variable resistance arm). Ratio arms typically of 10 ?, 100 ?, and 1000 ?. Accuracy of constantan coils. 1% for lower values and .5% for the higher values resistor. Two tapping key with silver contact provided for battery and galvanometers. Plug head made of bakelite. ?Enclosed in a polished wooden case with hinged lid.