A.C. Voltmeter, 150-600 volts non liner, semicircular scale ventilation holes. One termnal post on each side panel. Maker's name plate on top face below scale windo. Adjacent: spring-loaded contact button. Model 155. Serial Number 42339scientific instrument, ballarat school of mines, weston electrical instrument co

Milliammeter in wooden case, with leather range 100-500ma. Semi-circular scale with mirror-backed pointer.Model 155m Serial Number 38783scientific instrument, ballarat school of mines