Four operators feeding exposed prints of mechanical drawings into a “direct process” developing machine can turn out 18,000 copies in a 24-hour day at the Westinghouse works in East Pittsburgh, Pa. Applying the developing solution to prints, the 80-inch-wide Goliath produces “positives” with black lines on white paper, instead of white lines on a blue background as in blueprinting. Ordinary transparent drawings, or “tracings,” are used as originals in the printing machine which shines a powerful carbon are lamp through the tracing onto the coated paper. Where the light strikes the paper, the coating is dissolved by the developing process, but the chemical remains where shadows are cast by the lines of the tracing. The high-speed production of prints is an aid to defense, putting into the hands of machinists, assemblers and others exact plans for the parts on which they are working.