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THE PROJECTOR 239
rotation may be stopped by a slight touch of the finger at the rim of the reel. (113) Too much tension is bad. It is hard on the film sprocket holes; it wears the lower or "hold back" sprocket teeth unnecessarily. There must be just enough to drive the reel without danger of it stopping.
Magazine Rollers and Fire Trap
The rollers are presumed to make it impossible for fire to get through the fire trap. They are spaced exactly right by the manufacturer, the maximum distance being fixed by Underwriter's rules. (114) Where old films are usually used the fire traps should be examined once each day. When using new films, upon which the emulsion is soft, the rollers should be examined after the projection of each reel to make certain no deposit of emulsion has accumulated. (115) The fire trap rollers are made of material that requires no lubrication, but if lubrication seems necessary, use only a light oil sparingly.
Path of Film Through Projector Mechanism
(116) Projectionists should make a thorough daily inspection of the entire path of the film (commonly called the "film track") through the projector mechanism between and including the upper and lower magazine fire traps. (117) If first-run films are used inspections must be made after each run to make sure no deposit of the soft emulsion has accumulated at any point. A vast amount of damage, in the form of scratches in the emulsion, is inflicted upon film every day by these deposits of emulsion on metal.
In inspecting the film track, run your fingertips over each inch of flat space which the emulsion side of the film contacts in its course from upper to lower magazine ; also examine the fire traps and sprocket idler rollers for the same troublesome emulsion deposits.
(118) The aperture plate tracks or surfaces of the tension shoes (whichever the emulsion side of the film contacts) should also be carefully inspected before each