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Mar., 1933] EXCHANGE PRACTICE 201
(2) Treating and Processing. — When preparing a print for the exchange, it is desirable that the laboratory treat it so that:
(1) The pulling or straining of perforations, due to deposits of emulsion on the tension shoes or aperture plate of the projector be eliminated.
(2) The emulsion be so toughened as to resist scratching of the surface of the film as far as possible.
(3) The warping and buckling of the film, caused by the heating of the gelatin by the projection lamp, should be reduced as far as possible.
(4) The pliability of the gelatin and its binder should be as permanent as possible, so that the useful life of the film may be made at least equal to the booking period.
(3) Capacity of Reels. — A standard size of reel, agreed to and used by both the exchanges and the projectionists, must be adopted for the good of all concerned. The mounting of film in the exchanges on 1000-foot reels for transportation, the subsequent transferring of the film to reels holding from 1500 to 3000 feet of film in the projection room, and the re-transfer to the original 1000-foot reels for return to the exchange represents a great deal of lost motion. Needless time and effort is spent by the projectionist in making such changes. A like amount of time and effort is lost in the exchange inspection room in checking the correctness of the footage and of the heads and tails of the reels.
A large amount of film footage is lost because of this practice, and either all film should be mounted on large reels in the exchanges, or projectionists should be forced to discontinue the practice of mounting two or more reels of film on one large reel.
From an exchange standpoint, the 1000-foot reel is far more desirable, owing to the greater ease with which it can be handled and the greater efficiency with which it can be inspected.
The tensile strength of new film and its elongation properties will permit reels to be doubled under proper working conditions without damaging the film; but when the film has become seasoned the perforation area admits of less elongation than the center of the film and is, therefore, subjected to the entire strain of the traction load of the film in the upper and lower magazines.
The braking surface in the upper magazine, for properly controlling the feed of the film when the double reel is full, causes a tension to be applied to the later footage of the reel that often is greater than the elongation of the perforation area permits. The perforations, as a result, break down.
In the lower magazine, improper adjustment of the friction drive