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 #:
000534
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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516 RICHARDSON'S BLUEBOOK OF PROJECTION extent of the volume recorded. Hence the hiss and ground noise is always much less in volume than the sound at any given moment, and therefore inaudible. Construction of Photo-Electric Cell (12) The principle of construction in the photo-cell is very similar to that followed in the rectifying tube. In each case there is a cathode and an anode. (13) The difference is that the cathode of the photo-cell is not a filament serving as an emitter when it is heated, but a light-sensitive metal serving as an emitter when it is illuminated. When light is shut off emission ceases. The response is instantaneous. When light is admitted to the cathode the emission varies in strength in proportion to the amount of light received. . (14) Because it operates by light rather than heat, the cathode of the photo-cell is not a thin filament wire, but a broad surface constructed to intercept nearly all the light that enters the cell. It takes the form of a film or layer of the active metal deposited, in earlier types, on the inside of the glass of the cell, and in later types on a curved element provided for that purpose. (15) The anode or "plate" of the photo-cell is not a plate at all, but a thin bar or thin ring of metal that will shadow the . .. t ., Fig. 119. — A modern type cathode as little as possible. photo-electric cell.