Handbook for motion picture and stereopticon operators (1908)

Record Details:

Title:
Handbook for motion picture and stereopticon operators
Date:
1908
Publisher:
Washington, D.C. : The Knega Company, Inc.
Volume:
Handbook for motion picture and stereopticon operators
Leaf #:
00070
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 16, 2023
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64 Motion Picture (in series with the lamp), with an attendant generation of heat in the rheostat. To successfully illuminate a large screen a heavy current is necessary and a great deal of heat is generated in the lamp, which endangers the film owing to its inflammable nature, and for this reason protection should be provided. The 90° arc lamp is ideal for stereopticons, that is currents below, say, 30 amperes. For motionpicture machines, carbons in line hold the arc the best when 30 or more amperes are used. The hottest or brightest carbon is the positive and should be the upper carbon. If this is not the case, change over the terminals, or throw the switch over, if the machine is provided with a twothrow pale-changing switch, a safe and convenient arrangement. Heat Shield. A swinging metal shield between the condensers and the film window, operated by a foot treadle, by hand, or automatically from the crank, or both, is the usual method, though a glass tank containing water, glycerine, or a saturated solution of alum placed between the condensers and the film is sometimes used. A cover-glass close to and over the film window is also considered good practice and some machines are so made. The glass cover on both sides of the film where the heat strikes it,