Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000257
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
July 04, 2024
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MANAGERS AND PROJECTIONISTS 167 CONDENSER LENS SURFACE.— It is highly essential to even screen illumination and efficiency of service that condenser lenses be ground to a perfectly true surface and well polished. In Fig. 38 we see a condenser over which is placed a metal plate in which are drilled two small holes near the edge of the lens. The resultant rays pass through the aperture, as will be seen, and are by the condenser directed straight through to spots on the screen. In Fig. 39 we see the same thing exactly, except that the projection lens has been placed in position. These are actual phot o graphs taken of light rays, exactly as shown. A study of them will, we be1 i e v e, convince even the most skeptical that the condenser actually directs or projects the ray forward in a straight line toward the spot, aperture and projection lens. Now if the converging lens has not a perfectly true surface it natura 1 1 y follows that instead of the rays being all directFigure 37. e d forward