Rheostat is wound with heavily oxidized constantan wire on a vitreous enameled steel tube. The tube is supported on robust die cast end stands and the heavy duty sliding contact is of phosphor bronze, nickel plated for corrosion resistance, 4 mm terminal post are fitted facilitating external connection conventional 4 mm plug.
Rheostat measures 13" long, 2.5" wide and 4" tall.
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