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1950-51 Theatre Catalog, 9th Edition, Page 346 (324)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 346
Page 346

1950-51 Theatre Catalog, 9th Edition, Page 346



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The screen surface is molded in one piece, without a seam.

Molded holes, having smooth walls flaring out from the back of the screen, provide uniform sound distribution of higher fidelity.

Because these horn shaped holes are smooth and flaring, the normal vibration caused by sound is enough to keep them from becoming clogged with dirt. The sound holes remaining open assure no loss of sound

clarity as the screen ages.

The shape of the molded holes, having no sharp edges, makes it easy to remove dust from the surface by brushing. The PM White Screen may be cleaned with our special cleaner. The PM Silver and the HI Screens may be cleaned by brushing alone, their harder surfaces being more resistant to dirt.

The projection surface is molded in a series of elliptical waves extending from the back of one hole to the back of the adjacent holes.

These waves, providing a surface which is not flat, reduce the effect of side seat distortion.

Light lost through the holes is less than 8% of the total striking the screen, much less than the amount lost through porous fabrics. Because none of this light passing through the screen is reflected back, the picture is not degraded by back reflection.

The elliptical waves of the surface provide a sharper image by preventing loss of contrast. Bright light diffused from a white area cannot spread into a black area for more than the distance from one wave crest to the next, where on any flat surface it may spread for a considerable distance.

Improvement in contrast caused by this blocking of surface diffusion is most noticeable on color reproduction. Sharp, clean colors result from preventing color degradation caused by diffusion along the surface.

This improvement in contrast is carried further in the HI Screen, where a metallized filter coating still adds to the control of stray light. Sharpness, color, and contrast are greatly improved.

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1950-51 Theatre Catalog, 9th Edition, Page 346