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One of the most attractive motion picture auditoriums in the United States, and one of the newest, is the McCormick Place Theatre in Chicago's new lakeside convention center. Prominently featured in the house for live shows and lighting work are Super-Trouper spotlights made by the Strong Electric Co., Toledo. One is shown at the left above.
vious, by the use of friend "cross multiplication. Two times 24 is 48, and so is 6 times 8.
It is hoped that our readers who are completely familiar with the basic procedure with which we have dealt will overlook our attention to what may see elementary. It must be recognized, as we said in the beginning, that many projectionists have not had reason to use this information for some time, and we believe it can be useful in many instances.
With the knowledge covered in this paper, we are prepared to calculate precisely a given lens focal length. Let it be given that we wish to know the nearest lens focal length for an aspect ratio of 1.75 to 1. Incidentally, this ratio would be set up as follows: 1.75/X= .825/X.
The "cross-multiplication" step would produce the results as set forth here: We find by dividing .825 by 1.75 that the vertical dimention of the 1.75 to 1 aperature must be .471".
Now, if Cinemascope pictures are projected with a 5.25" lens, we would set up our ratio thus: .715" I (Cinemascope aperture dimension) | is to .471" (1.75 to 1 aperture verI tical dimension) as 5.25" is to X. This would be written .715:.471=5.25: X. Multiplying means and extremes, we obtain .715 X =2.47275. When we divide 2.47 by .715 the answer is 3.45, which would indicate a preferred lens focal length of 3.5". It might be nec
cessary to file the .471" aperture slightly, but we very likely would obtain the desired aspect ratio with a minimum of fumbling and correction. This is but one instance, of the use of ratios in the projection room, and we hope the easy way to compute ratios will prove of value to others in the future. iP
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*No vacuum tubes, no photoelectric cells.
*and the only American-made 70 mm 35 theatre projection systems
SEE
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DEALER
for bigger, brighter projection.
CENTURY PROJECTOR CORP.
New York 19, N. Y.
International Projectionist
February 1962
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