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

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 #:
000119
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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\^*&ImJo»CL*4 CHAPTER V. LENSES AND MIRRORS (1) Before the projectionist can hope to deal intelligently with lenses and their action upon light, he must understand certain basic laws, one of which has to do with light intensity at varying distances from an open light source. It reads: (2) "Light intensity decreases inversely as the square of the distance from its source. " Figure 30 (3) In Fig. 30 we see an open light source with three screens, A, B and C, located one foot, two feet and three feet respectively from the light. Screen A, we will assume, is exactly one foot high and one foot wide. It therefore represents one square foot of area. Screen B located two feet from the light, has twice the dimensions of screen A and is 4 feet square. Screen C is 3 feet 101