File:Handbook for motion picture and stereopticon operators (1908) (14596133677).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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rs at each end of the tray and the other endof the film fastened to the other spool. The filmafter saturation is wound from one spool to theother through the solution again and again untilfull detail and proper density is secured, whichcan be determined by picking up the slack of thefilm and examining it before a conveniently-locatednon-actinic light. The trays are readily removed,without disturbing the spools holding the film, andthe washing, fixing, hardening, soaking, etc., cantherefore be quickly and conveniently done. Test Strips. In determining the development nothing is bet-ter than developing small test strips, timing andtreating the development of the full-length strip tocorrespond with the test strip. Generally, the de-velopment should be continued until the face ofthe film is more or less shadowed over and theimage well silhouetted on the back. The develop-ing frame is then lifted out and set in the wash-ing water for two or three minutes, and then put Operators Handbook 31
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32 Motion Picture in the fixing bath. The fixing should, as a rule,be continued as long again as it takes to make theimage disappear. The film should then be thor-oughly washed. An acid fixing bath with suffi-cient sulphite to keep the film clear is best, withalum to give it hardness. Washing and Hardening. To wash 25 minutes in rapidly-changing wateris usually long enough, after which the film shouldbe given a glycerine bath of five minutes (see for-mulas in back of book). If no cold water can beobtained, give the film a preliminary bath in alumor formaldehyde solution before developing; oneounce of formaline to 60 ounces of water. Developers. The standard pyro developer is in favor withmany operators; but for traveling, the metol-hydrodeveloper is one of the most desirable. It keepswell, and a great number of films can be developedtherein. Rodinol is another good developer—asingle solution developer. The metol bicarbonateformulae to be found in the back of this book isespecially g

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