The Qualities of Incandescent Lamps

The application of scientific principles and engineering methods in the incandescent electric lamp field is outstandingly successful, and is one of the distinguishing features of American engineering. In this paper methods of appraising the qualities of electric lamps are discussed. The wide difference in quality between lamps that comply with American specifications and those that do not, and the economic consequences of the use of lamps that are without benefit of scientific methods are indicated.