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 #:
000715
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:
March 21, 2024
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DEFINITIONS 697 Synchronous Motor An a.c. motor that must be brought up to normal speed of operation by a split phase or other means before being connected to the power circuit. It then runs "in step" with the alternations of the current driving it. Take-up A variable tension device by means of which film is wound upon the lower or take-up reel of a motion picture projector. Tension As applied to projectors, (a) frictional pressure exerted upon the film at the aperture to bring successive pictures to a stop over said aperture, (b) Tension exerted by some suitable device upon the shaft carrying the lower or take-up reel of a projector. It must be such as will provide slippage to enable the lower reel to rotate at varying speed, gradually slowing up as diameter of film roll increases during the process of projection. Tension Shoes Metal bars bearing upon the film at the projector aperture, upon which the tension springs exert pressure. Tension Springs Springs exerting pressure upon the tension shoes. Three-Phase Current An alternating current in which three pressure waves or electro motive forces are exactly 120 degrees apart. Throw See Projection Distance. Torque Pulling force which tends to create rotary motion, as in the rotor of an electric motor. Trailer A short length of film, usually opaque, attached to the end of each reel of film to protect it from damage.