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 #:
000154
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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136 RICHARDSON'S BLUEBOOK OF PROJECTION when it was shifted to a position between the light source and the aperture it cut the heat down approximately 50 percent. The mirror hot spot, therefore, is no longer an important point. Rear shutters create a strong current of air which has a very decided cooling effect at the aperture. (144) In choosing between the mirror collector and the 2-lens glass condenser remember that the mirror, of the two, is the more efficient collector of light. It is slightly deficient because of its high aperture temperature but it is still to be preferred except where a straight high arc is used which must have a 2-lens glass condenser. Mirror Action We will now try to make clear the action of curved mirrors used in high and low intensity reflector type Figure 47 lamps. Fig. 47 shows a curved mirror and projector aperture, with the light source AB in two positions. The mirror being spherical, its curvature corresponds exactly to that of the broken line curve, the center of which is at A. (145) Now if light source A were a point (having