Motion Picture Herald (Oct-Dec 1955)

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Test ’em at Our Expense! Free Samples on Request Larger Core for Greater Crater Area means MORE BRILLIANT ILLUMINATION for SHARPER, BRIGHTER PICTURE CinemaScopE VIST A VISION AND ALL OTHER WIDE AREA SCREENS Longer Burning Economical to use Amp. Volts Pos. Grade Neg. Gradt 40 (I Kw) 28 42-80 31-38 55-05 34-37 70 38 05-70 35-37 75-00 30-40 00-05 37-40 00-00 50-55 100-4 10 115 02 115-130 130-150 05-07 150-160 60-70 170-100 00-09 7x14 7x14 8x14 8x14 9x14 9x14 9x14 9x20 10x20 10x20 11x20 13.6x22 13.6x22 13.6x22 54IC 544C 544 C 544 544C 544C 544-1 OC 552-09 552-09 552-09 55209 55301 523 583-08 6x9 6x9 7x9 7x9 7x9 8x9 8x9 5/16x9 11/32x9 3/8x9 3/8x9 7/16x9 1/2x9 1/2x9 545-20C 545-C 545C 545C 543C 545C 545C 557C 557C 557C 557C 557C 555C 555C There's a Lorraine Carbon for your particular lamp Write for your FREE NEW LORRAINE CARBON CHART of recommended amperages, voltage and arc gaps. CARBONS Inc. BOONTON, N.J. Better Projection A Department on PROJECTION So SOUND Light Requirements with Large Aperture Projection By CIO CACLIARDI A great deal has been written about the efficiency of various projection systems and the necessity for well distributed screen illumination. Projection lenses and lamphouse optical systems have been improved considerably. Their light gathering power and transmission speeds have been getting higher and higher. Today standard 35mm film is being subjected to the maximum possible light and heat radiation. The next step in the ladder of projection progress seems to be the use of larger fdm areas in the projector gate, and this means using considerably wider apertures than GIO GAGLIARDI heretofore. Let us examine the relationship between light sources, lamphouse optics, projector film gate size, lens aperture and screen illumination. Going back to the original fundamental theory of projection, we consider the basic elements of an optical train in Figure 1. A simple lens is used to project the image of the film gate on the screen. The source of illumination is an evenly lighted, large ground glass surface which is perfectly diffusing and which is large enough so that the projection lens will see nothing but the light source from all possible angles through the film gate. If the diffusion is perfect, this light source will appear equally bright from every angle of view and the lens is said to be completely filled with light. With this particular method, the brightness at the center of the screen will be 22 MOTION PICTURE HERALD, NOVEMBER 5, 1955