Preliminary measurements on temperature and selective radiation of incandescent lamps

Abstract

The high efficiency attained in some recent metal filament lamps raises the question whether this is to be attributed to selective radiation or to a higher working temperature of the filament, or to both. As in this region of high temperatures almost no data are available at present, the results of some preliminary measurements on the temperature and selective radiation of a number of metal filament lamps are given in this paper.