GB190000045A - Improvements relating to Electrical Incandescence Lamps of the Nernst Type. - Google Patents

Abstract

45. Feeny, V. I., [Allgemeine Elektricitõts Gesellschaft]. Jan. 1. Incandescent lamps. -A lamp is made with two filaments or rods of equal lighting power, one being of carbon, silicon, a mixture of these, or other material which conducts and becomes incandescent immediately when current is supplied, and placed so as to heat the second filament, which is of material conducting only after preliminary h e a t i n g ; when the second filament has become incandescent, the supply of current to the first one is stopped by automatic apparatus. The filaments may be mounted in an exhausted or open bulb, or in a bulb containing an indifferent gas, as required by the materials used. In the form shown in Fig. 1, the space between a bulb d and an enclosed glass tube b is exhausted, and contains a carbon filament c ; the tube contains the second incandescence body a, and is internally open to the air. The invention is a modification of that described in Specification No. 23,470, A.D. 1897.