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CARBON ARC FOR MOTION PICTURE PROJECTION
By W. C. KUNZMANN
The motion picture theater is a permanent institution as is evidenced by the developments during the past two or three years. Hundreds of motion picture theatres have been built which are second to none of the legitimate with respect to size and appointments of interior and exterior. The productions, too, have kept pace with the theaters. These productions now depict on the screen picture plays costing hundreds of thousands of dollars and employ the best of theatrical talent as principals. The picture producing interests have invested fabulous sums in permanent studios fitted with every conceivable contrivance necessary for the production of practically any play and the innumerable feature incidents which occur in the lives of any and all people of this world.
The art of the motion picture is composed of two principal industries, the manufacturing industry and the exhibiting industry. This paper will describe some of the features of the production of light and its projection through the film as applied to the exhibiting of a motion picture.
The resources available today that answer the general requirements of the light source for motion picture work, that is, steadiness, maximum intrinsic brightness and distribution characteristics permitting a high degree of concentration, are the direct and alternating current carbon arc and the high power incandescent projector lamp.
The carbon arc brilliancy of 84,000 c.p. per sq. in. (130 c.p. per sq. mm.) is sufficient for any condition of operation, while the brilliancy of the incandescent projector lamp approximately 20,000 c.p. per sq. in. (or 30 c.p. per sq. mm.) is only sufficient for low-powered installations at present. This paper will deal exclusively with the carbon arc as applied to the motion picture exhibiting industry.
The Projection
The projection system optically is practically in the same state of development as the first successful machine. A line drawing will illustrate the important features of the equipment.
Fig. I
Fig. 2
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