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MANAGERS AND PROJECTIONISTS 1177
It really need not be more than six or eight inches long, by an inch and a quarter wide, if made of metal. It would have the advantage of being perfectly true and unresilient.
(f) STARTING THE SHOW.— (1) Make sure that the reproducer arm swings perfectly free. Any binding may and probably will cause it to jump the record grooves, and thus ruin the synchronism. An ounce of prevention (testing) is worth several pounds of excuses. Don't take things for granted. Test them.
(2) Select the record to be used. Check its number against the film number. Check the number of times used, including this show. Don't neglect these things. Do your work right.
(3) Set the projector mechanism framing lever in mid position. Rotate the mechanism flywheel until the exact point at which the intermittent movement has ceased to act is ascertained — intermittent sprocket has ceased to move — and then thread in the film, as follows : At the beginning of each reel you will find a frame marked "start." Place this exactly in frame over the aperture. In this connection see Fig. 428 and instruction (b), page 1171.
IMPORTANT. — In this connection, when the exact point at which the intermittent sprocket has ceased to move has been ascertained, since it must be thus located every time a disc sound reproduction film is threaded in, the operation of finding it will be much simplified if a white mark be made on the rim of the rotating shutter opposite some convenient fixed mark. Or a stiff wire may be attached to the wall or some portion of the projector mechanism, its end near the shutter rim, and the