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

Page scan 000145 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 #:
000145
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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LENSES AND MIRR( 127 of screen illumination. Fig. 41 -A is a graphic illustration of the experiment. Fig. 41 illustrates the fad that the light beam between the projector aperture and the lens does not always have an even light intensity. It sets forth the intensity of light at various sections of the beams, as measured for the Bluebook recently by Eastman engi neers. Light values have changed widely, but light distribution, as shown in Fig. 41. has not altered in any appreciable degree. J Figure 41a Observe that in the center zone the light intensity is 24.3 foot candles. Because the total area of the zone is very small, the light flux therein represents only 10.8 percent of the total, regardless of the fact that the small zone is very brilliant. Examining zone 2 we see that the light intensity drops to about 13.6 foot candles, but nevertheless, because of the larger area, zone 2 supplies almost five times the total light 1-9.2 percent more than zone 1. — while zone 3. which drops down t<> 5.9 f< >«>t candles, supplies 40 percent of tin total illumination. A very interesting point here is that whereas these are the measurements when the converging lens is IS inches from the aperture and the projection lens at a 3 inch working distance, when the converger is the same distance from the aperture, but the projection lens at