Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
00035
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 492a i::::::::3::::::::::it::::::::i:::::::tj:i:y5:i:5:t:t:::::!::!:5 :::::::::::::::::::::::::::::;:::::::::::::::j»ij:::s:ju::!:r "":n:::::::£U:::jnc5:2r5" — "■•■••■?•• •••••£•; SURFACE H ratio below a certain limiting value satisfactory picture brightness may be obtained for all observers. This factor alone, however, is not sufficient for the classification of screens according to their relative merits. The highest average reflection factor within the required angle from the normal will necessitate the least energy expenditure in the projecting system to produce a specified screen brightness. The values of ratio and R tabulated in tables 3, 4, and 5 are therefore of direct applicability, in deciding upon the suitability of any screen for use in a theatre where the angular distribution of the seating capacity Is known. Now it seems reasonable to demand that the ratio of the brightness on the axis to that at the extreme angle of observation shall not be greater than 4.0. This value is decided upon after consideration not only of the variation in brightness as observed from various points in the auditorium, but also from