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

Page scan 000147 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 #:
000147
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 MIRRORS [20 It is thus evident thai any unnecessary distance of the light source to collector involves heavy light loss. Limitations Governing Distance (119) Limitations vary with the character of the light source. With mazda it is almost wholly optical, the only other limiting factor being the diameter <>f the mazda lamp globe, which itself prevents the light source (filament) from being advanced nearer to the collector lens by more than half its diameter. Figure 42 The optic requirements for the distance from the light source to the collector demand the beam of light to spread sufficiently to form a "spot" of sufficient diameter at the required distance from the converging lens to the projector aperture. As the light source is brought nearer the collector lens of a condenser, or the surface of a curved mirror, such as is used in projection, the light beam on the opposite side of the condenser or in front of the mirror or condenser converging lens is increased in diameter.