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430 PRECAUTIONS FOR MOVING PICTURES [Cn. XI
5. Get the film together so that the two parts of the film are in a straight line and not at an angle.
6. Get the sprocket holes together, so that they will match accurately.
7. Press the film firmly together without any sidewise motion. It is well to practice on short pieces of scrap film until strong
splices fitting together accurately can be made quickly.
There are two kinds of film cement, one which is good for celluloid films only, the other (NI cement) will work equally well on non-inflammable film and celluloid film.
For making permanent patches in a routine way there is a film mender (fig. 23 5 A), consisting of a guide and a pressure clamp, so that the film maybe accurately held while being cemented together.
All splices should be as far as possible made before beginning a performance. Any old splices which appear weak and likely to pull apart should be pulled apart and cemented together again.
With the greatest precaution a film will sometimes come apart during an exhibition. When this occurs the film is pinned together to be spliced permanently later. Be sure to remove pins and make permanent splices before attempting to run the film through the machine again.
WINDING AND REWINDING
ยง 595. A device to wind the film from one reel to another is a part of any moving picture outfit.
While passing through the machine the film is always wound on the lower reel in the wrong direction for use, and it is necessary to rewind it, so that it will be right side out again.
While rewinding is the time to remove pins and splice permanently any breaks in the film which occurred during an exhibition.
In most moving picture theaters one film is rewound while the next film is being shown, the operator turning the moving picture crank with one hand and the rewinder with the other hand. When the rewinding is done this way very rapidly and the rewinder is fastened to the walls of a sheet iron booth a decidedly terrifying sound may be produced.