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20
The Motion Picture Projectionist
November, 1927
Developing (Jilrn in a New IVay!
By R. MERRITT LACEY
THE automatic developing machine shortly to be marketed is a time and labor saving device created to facilitate and make more efficient the laboratory branch of the motion picture industry. Not only does this machine eliminate a great deal of space, time and men in the process of developing and drying film, but it effects saving in other departments also. To begin with, films may be printed in rolls of 1000 feet instead of the customery rolls of 200 feet or less. This eliminates the constant handling of the film by the printing room girls and likewise the threading and re-threading of the printers.
When the printed stock is first received in the developing room, it is placed upon the supply spindles on the developing machine in rolls of lOOO feet each. Leaving the supply spindle, the film is carried over a compensating elevator before entering the developing tubes. The purpose of this elevator is to permit continuous running of the machine, so that when one supply spindle is emptied and the film at that point stops, the rest of the film on the elevator continues to feed the machine allowing the operator a minute or so to make a splice from the last of the film on the first supply spindle to the first of the film on the second spindle. These splices are made with little wire clips and can be affected in less than ten seconds.
The development of the film is a process of carrying the film up and down through a series of pyrex tubes. Throughout these tubes the developing chemicals are automatically circulated from and through a common storage tank where the exact temperature and strength of the developer is maintained at all times. The develop
CGMPENS
mg solution in the developing tubes therefore, is always correct both as to its strength and to its temperature and never varies day or night, winter or summer.
Leaving the developing tubes the film is carried through a similar series of tubes the first of which is a cold water bath, and then a series of hypo tubes. In the latter tubes the film is fixed — that is the unexposed silver in the emulsion is dissolved out of the film and the emulsion itself is hardened.
The film is then carried through another series of tubes in which it is washed. These tubes contain clear circulating water of the proper temperature and at one stage of this progress it passes over an inspection light by which the operator is able to judge the photographic quality of his film as it is being processed.
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