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238 Motion Pictures in Education inch strip of film exposed and scrape the emulsion off clean. Apply the film cement to this strip so that every part is covered, and place the celluloid side of the other end on top so that the two frame lines come together. Press tightly together for a moment or two and the job is done if the cement is good and you have been skillful. If not, apply the cement again. If it does not hold then you may as well begin all over again and cut away the width of another frame from each end, for film will not weld unless thoroughly clean. If a splice comes apart it is usually best to cut away the width of a frame on each end and make a new splice. If a splice comes apart in the machine below the gate, it will be necessary only to start and run the motor sufficiently to give you film enough to attach with a paper clip to the film on the take-up reel. If the separation occurs above the gate, you will have to re-thread. A reel of film should always have a piece of extra film or "leader" spliced on to the beginning to be used in threading up and to protect the picture. If the leader should become unspliced it should be patched on again. This may be done without scraping, by placing the two celluloid sides together. Another piece of leader is needed at the end of the reel to protect the film as it leaves the mechanism. As a protection against fire and for the sake of neatness all reels which are not in actual use should be kept in the cans or containers in which they come from the exchange or film library. Never let the rays of light from the lamp play on the film or film gate when the film is not running. When you wish to stop the machine turn out the light, turn down the douser, or push the lamp house