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the emulsion must be removed first, preferably by gentle scraping, and taking care not to damage the perforations. The emulsion dust should then be removed by blowing and the cement applied, for which a camel-hair brush should be used. The glass rod which some manufacturers supply with their film-cement is not very practical, chiefly because it does not allow the user to control the exact amount of cement required for making a perfect join. A large drop from the glass rod will immediately spread, and because of its softening effect on the film, may result in the latter actually joining with the surface of the press, thereby making it necessary for the film to be pulled from the press after making the join.
However, the correct method for making a join will depend on the type of splicer being used, but in every case the result must be a perfect join. Nearly perfect won't do at all.
A good join is one in which the film is actually welded together, for the cement so softens the film that the ends are united into one piece. They do not merely stick together.
When choosing a splicer it is best to get one with an over-all length of at least 4 ins. and having at least three locating pins spaced on each half of the press. If only two pins are used there will be a possibility of the film moving, and at least three pins should be engaged if the film is to be correctly aligned. Also, choose a splicer with a perfectly smooth and rustproof surface, and one which may easily be cleaned without having to take it to pieces. But the best, of course, is the type on which it is only necessary to follow the maker's instructions in order to make the perfect join.
When joining sound-films you must not forget to paint over the sound track when you remove the film from the splicer, for the act of scraping usually removes everything but the colourless base of the film itself, and if the exciter rays are allowed to pass through a clear spot on the sound track at the join you will get a "plop" from the loud-speaker. The sound track is best painted with the same kind of black dye used for retouching photographs, and for this job is far better than Indian ink, as the latter tends to flake off after a time. But care must be taken not to allow the paint or ink to spoil the sound track on either side of the join.
If a faint plop can still be heard, even though you are sure
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