Rheostat 20 Ohm. A range of rheostats or potentiometers ideal for school use. Consisting of heavily oxidised resistance wire wound upon vitreous enamelled steel tube and locked into place with ceramic cement, multi-leaf phosphor bronze heavy duty sliding contact on nickel plated rod. Robust enamelled die-cast end stands and 4mm socket terminals. Dimensions (Dia.): 43mm.
