F. H. Richardson's bluebook of projection (1935)

Page scan 000175 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000175
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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SCREENS 157 (41) Perforated screens were introduced to permit the passage of sound from loud speakers behind, but competent sound engineers state that the loud speakers may be located either at the top, bottom or sides of the screen without impairing sound quality or direction. We will qualify such statements by saying that a solid screen can replace the perforated screen with equal or greater efficiency in all theatres except those wherein a considerable percentage of the audience views a picture from an angle greater than thirty-five degrees in relation to the screen. How to Obtain Viewing Angles (42) It is an easy matter to calculate the viewing angle from any portion of a theatre to the center of the screen. No special equipment is required. Make a mark in the horizontal center of bottom of the screen, < 71 / I / 1 / i \ / *K y v Figure 51 calling it point A. From this mark measure the distance, in inches, to the center of the back of the seat for which calculations are being made. Call this point B. From point A stretch a line back at exactly right angles to the screen surface, a distance a little more than equal to the distance from point A to point B. Use a good carpenter's steel square to get the angle. Anchor this line to a board laid across the center aisle on the