File:Handbook for motion picture and stereopticon operators (1908) (14779494411).jpg

Identifier: handbookformotio00jenk (find matches)
Title: Handbook for motion picture and stereopticon operators
Year: 1908 (1900s)
Authors: Jenkins, C. Francis (Charles Francis), 1867-1934
Subjects: Motion Pictures Motion Picture Technology
Publisher: The Knega Company, inc.
Contributing Library: Niles Essanay Silent Film Museum
Digitizing Sponsor: Media History Digital Library

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orforward. This arrangement also permits of therapid and proper framing of the picture, just as inprojection. The film should run down loosely intoa tight receptacle below, a box or lined basket.There should be a feed-out sprocket for the nega-tive and one for the positive, to feed out a littleloop above the window, the same as in a projectingmachine, in order to make the work of the feedmechanism as light as possible, insure perfect reg-istration, and prevent damage to the holes in thefilm. The ordinary incandescent lamp is suitable,a 16- or 32-candlepower, according to the density,located from 3 inches to 1 foot distant from thenegative. A piece of ground glass is arranged infront of the window for diffusion. Some opera-tors use two or three thicknesses of ground glassso that one, two, or three thicknesses may be usedaccording as the density of the negative requiresit. The machine is turned by hand; and it isdesirable to have two speeds, one picture to a turn, Operators Handbook 41
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CABINET PRINTER. 42 Motion Picture and two pictures to a turn. This permits widevariation with considerable precision. Run about100 feet through in five minutes. Developing Positives. The development of positives is similar, and thesame apparatus is used, as in developing negatives,although different chemicals are recommended;developers which will give the clearest high lightsand soft blacks in the shadows. The high lights should be perfectly transparent,and the detail in the shadow fully developed, infact, treat the film as though one were making alantern slide. The film may be toned if desired. Chromogene Colors. Some very pleasing effects are secured by toningsolutions which act only on the dark parts of thefilm, that is, colors which act only on the silverdeposits, leaving the clear portion of the pictureunaffected. Of these, some of the best are chro-mogene colors. The effect on the canvas is clearwhite sky w^ith all objects in one color. Automatic Changing Tints. In tinting lant

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