Abstract
One of the immediate results of the introduction of the high current incandescent lamp into the motion picture industry has been the emphasis placed upon an old problem of applied optics; that is, the production of a field of uniform illumination from a non-uniform light source. The crater of the carbon are, which preceded the incandescent lamp in projection service, is sufficiently uniform in brilliancy from edge to edge to give an almost constant illumination at all parts of the screen, but the incandescent filament not only varies in brightness in different parts but it has open spaces of about half the filament area in extent. The illumination at the aperture and on the screen has a natural tendency to show an image of the filament, and the suppression of this image is the problem with which we are here concerned.
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