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

Page scan 000152 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 #:
000152
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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34 RICHARDSON'S BLUEDOOK Of PROJECTION circle, the center of which is, at the light source, a curve representing the circumference passing through both edges of the lens. The 70 degrees do not represent the total light picked up since in the case of either lens or mirror the strongest light goes straight out from the face of the crater floor. Figure 45 Were the lens located 4.5 inches from the light source it would intercept but a 50 degree angle of light, the two distances representing the minimum and maximum distances from the light source to the lens or mirror. (140) Turning next to Fig. 46, we view a mirror collector 7.5 inches in diameter, the light source located 3.3 inches from its vertex (center). It will intercept an angle of light of 120 degrees. If we increase the mirror diameter to 8 inches and locate the light source 4.5 inches from the mirror vertex, it will still intercept a 100 degree angle of light, as against the smaller angle available to the 4.25 inch free diameter glass collector under analogous conditions. Even if we use a 6y$ inch diameter mirror, with light source 3.75 inches from its vertex, we can collect approximately a 95 degree light angle.