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 cellu- 

 loid 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 



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 per- 

 manently any breaks in the film which occurred during an exhibi- 

 tion. 



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. 



