ELECTRIC INCANDESCENT LAMP

摘要

1 PHN 9137 Electric incandescent lamps having a bromine and hydrogen containing gas filling are also provided with iodine if they are to have a long computed life. This has a protecting influence on the colder tungsten parts of the lamp. However, the use of iodine also exibits disadvantages. In lamps according to the invention the currens inside the lamp envelope is supplied to the coiled coil filament via a helically-wound tungsten wire which is screwed in or around the filament and is in ingagement with at least a secondary turn of said filament. This construction enables the omission of the use of iodine.