Cine-film projection : a practical manual for users of all types of 16-mm. (1952)

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the same time bring up the volume. If you are using the nonsync lower its sound towards the end of the Censor's Certificate showing on the screen, and then change over to film sound and bring up the volume again. Re-focus, if possible, on the wording of the titles before they pass. When the projector is running to your satisfaction, and providing the condition of the film allows you to leave it for a few moments, check up on the sound in different parts of the hall — you may find that the tone and volume need adjusting again. In halls where the ceiling is arched or curved you may find that the sound is louder in the centre and perhaps slightly muffled at the sides, and it is sometimes possible to correct this by moving the position of the loud-speaker. But this is only an example, and as no two halls have the same acoustics, it will be necessary for you to experiment in order to get the best results. (Do not move the loud-speaker about during the show unless it is absolutely necessary.) At the end of each spool switch off the lamp and lower the sound, then switch over to your non-sync and raise the volume again. (But not, of course, if you are using two projectors and are about to change over.) Always put a record on at least half a minute before the end of the spool. And don't give your audience swing music in the middle of a film on religion ! Switch off the motor when the film has passed the last sprocket wheel, then change the spools as fast as you can. Should the film break during the show the motor must at once be stopped and the film relaced. Do not use the splicer until after the show. First remove the ends of the film from the projector, or only the take-up end if convenient, then relace the end from the feed-spool and run the motor until you have at least two feet of film to spare. This end should then be placed under the end hanging from the take-up spool. Next take up the slack so that the end on the take-up is wrapped over the end from the projector, then with a finger lightly holding the ends in place, restart the motor with the other hand. If you are not sure about this you should ask to be shown. On projectors fitted with a belt-driven take-up, and providing the film has broken after clearing the last sprocket, it may be possible to tuck in the broken end onto the take-up without stopping the show. To do this the take-up spool is stopped 103