Improvements in Ballast Resistances and Cut-outs for Nernst Lamps

11,557. Potter, H. N. June 26. Drawings to Specification. Resistances. - Steadying-resistances for incandescent oxide lamps consist of straight iron wires in a glass vessel which is exhausted of air or filled with hydrogen or other indifferent gas, the wire being heated nearly to redness when in use. The expansion of, or heat from, the wire may operate a cut-out for the auxiliary heater of the lamp.