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MANAGERS AND PROJECTIONISTS 640
to get the sprocket shaft lower on one end than the other, under which condition the sprocket will not be square with the film, and the teeth on one side of the intermittent sprocket will have to do most of the work in pulling the film down. This matter should be watched very closely when an adjustment is made.
GENERAL INSTRUCTION NO. 14 — MAGAZINES IN LINE. — With modern projectors the position of the upper and lower magazines are fixed, and they cannot be located wrongly. With some of the older types, however, it is quite possible to get the magazine out of line sidewise with the sprockets, and this should be guarded against, because a magazine out of line is likely to cause a great deal of trouble, in several different ways. If the lower magazine is out of line, the take-up will pull the film sidewise, which will create an added tendency to lose the lower loop. If it be the upper magazine that is out of line, the film will not approach the upper sprocket squarely, which may cause trouble, and in any event it will rub against the metal of the fire trap with possible damage to the film itself, and certain damage to the trap.
GENERAL INSTRUCTION NO. 15— PROJECTION ROOM REELS. — We very strongly recommend that the projection room have a full complement of reels, and that the exchange reels be used only in the upper magazine for the first run of the film after it is received, and in the lower magazine for the the last run of the film before shipment.
THE CONDITION OF REELS SENT OUT BY EXCHANGES IS, ALL TOO OFTEN, NOTHING SHORT OF AN OUTRAGE.
They are more often than not a cheap, flimsy affair, with a hub and spring clip in more or less wretched condition, with their sides bent and wobbly, and very frequently they have sharp edges of metal caused by the punchings of the reel sides when they are made, which to a greater or less extent injures the film.
Only projection room reels should be used for projection, and they should be kept in first class condition. Use of reels in bad condition causes an enormous amount of damage to films, both in rewinding and in projecting. Reel sides very often rub on the magazine side, thus setting up braking action, which, under some conditions, will pull the film in two. See Page 322.