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1. The Stineman tank. The frame on which the film is wound consists of a strip of metal about % of an inch wide wound in the form of a spiral. During winding, the frame is suspended at the center on a pivot and the film wound celluloid side to the metal strip. The developing solutions are contained in flat trays or tanks.
2. The apron developing outfit. Motion picture film can be developed by winding in contact with a flexible apron in a manner similar to the method employed for developing Kodak film in the Kodak film developing tank (see aA Portable Apparatus for Developing Motion Picture Film/'2 also Figure 12).
Fig. 12. A Portable Apparatus for Developing Motion Picture Film
3. Collapsible reels. Many types of collapsible reels are available and are used mainly for field work. The complexity of the apparatus increases with the number of slats used, though as mentioned above, the number of slats should be as large as possible. The most convenient way of attaching the slats is to fasten them to strips of canvas in a manner similar to that employed for constructing roll-up shutters. The slats are then readily attached by stretching the canvas belts around the ends of the reel.
Method of Attaching Film to Slats.
The following methods are in general use :
1. The eyelet and rubber band method. An eyelet is first placed in the end of the film which is then attached to the slat by means of a rubber band. Suitable eyelet machines are sold by the United Shoe Machinery Company. It has not been found practical to punch the film and insert the eyelet with the same dies. The machine is less liable to get out of order if a hole is first punched in the film by a separate punch and the eyelet then inserted.
2. The film clip method. A film joining clip sold by R. C. Mercer, Los Angeles, is illustrated in Figure 8. This clip replaces the usual pin, does not damage the film, and can be quickly inserted and removed.
In both cases a stout rubber band is employed which serves to take up the slack caused by expansion of the film in the developing solutions and shrinkage on the drying reels.
The Winding Frame
In order to wind film on the vertical developing rack, the rack is supported in a frame so that it can be rotated on a horizontal axis
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