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Use of G-3 FilmProcessing Tank*
BY ROBERT E. LEWISf
t ARMOUR RESEARCH FOUNDATION OF ILLINOIS INSTITUTE OF TECHNOLOGY, CHICAGO 16, ILLINOIS
AND
HENRY C. FROULAft
tfFoRMERLY, ARMOUR INSTITUTE OF TECHNOLOGY; NOW, UNIVERSITY OF CALIFORNIA, Los ANGELES, CALIFORNIA
Summary — The processing of lengths of film by winding the film back and fortji between immersed spools is possible because of the activity by solutions entrapped between windings as well as the activity of solutions on the film in transit. Field and laboratory processing methods have been developed for the G-3 tank which handles both 16-mm and 35-mm film up to 100-foot lengths.
THE NEED FOR the processing of an occasional hundred feet of film, or the field processing of film without continuous machines, has given rise to several types of film-processing systems, the most widely known being the Stineman system. The introduction of the G-3 tank** has enabled more convenient manipulation with results differing as a consequence of basically different conditions. Whereas the Stineman system places the film on a spiral in a flat tank, the G-3 tank depends on winding the film back and forth between immersed spools. The success of this method depends on the frequent winding of the film to refresh the exhausted chemicals entrapped between layers of film between windings. The solutions are also acting on the film as it travels from one winding to the other, though this time is small in comparison to the dwell between windings.
The confinement of developing solutions between film layers is not the same type of condition for which the standard mixture is formulated such that modifications by the addition of antifoggants are usually of value (Tables I and II) . This is because of the effect of confinement of a restricted quantity of solution which may, depending on the image density, become fatigued prior to rewinding and
* Presented October 21, 1947, at the SMPE Convention in New York.
** Morse Instrument Company, Hudson, Ohio.
474 MAY, 1948 JOURNAL OF THE SMPE VOLUME 50