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MANAGERS AND PROJECTIONISTS 257
a normal size picture would appear as being 6 feet. 3.6 inches tall ; also his head would be smaller in proportion than his feet, though this latter, if confined within this range, will not injure the results perceptibly.
While the following figures are not exactly correct, they are nearly enough so for our purpose.
Given a projection distance of 80 feet, the following projection angles will increase the height of a 16-foot-wide picture as follows :
Angle of 10 degrees increases height 4.5 inches. Angle of 15 degrees increases height 7 inches. Angle of 20 degrees increases height 13 inches. Angle of 25 degrees increases height 20 inches. Angle of 30 degrees increases height 32 inches.
WHEREIN THE EVIL OF DISTORTION LIES.— The
average exhibitor, and very many unthinking projectionists, believe that so long as the sloping sides of a distorted picture are made perpendicular, which may be done (see Filing the Aperture below), there is no remaining evil except the added difficulty of obtaining sharp focus all over the screen. They base their belief on the fact that the theatre patrons do not know or realize that the picture is distorted, hence no harm is done.
This is fallacious reasoning. Admitting the fact that if the sides of the distorted picture be made perpendicular, the audience, having nothing as a basis for comparison, probably will not know the distortion is present, the fact remains that the distorted picture is not nearly so pleasing to the eye as the undistortect one, or the one only slightly distorted, end since theatre patrons pay admissions to theatres in order that they may be amused and entertained, it follows that the more pleasing the appearance of the picture as a •whole, aside from its merits as a play, the better satisfied the patron will be, and the better satisfied the patron is, the more he is likely to patronize the box office frequently.
FILING THE APERTURE— Side lines of Keystone may be made parallel by filling side of aperture with hard solder or procuring special aperture plate from projector manufacturer and filing sides to suit. First project light to screen and make mark on screen at lower ends of top corner curves. Then remove aperture and fill in sides or substitute special aperture. Next place a metal plate over the lamphouse cone, in the