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Some projectors take longer than others to reach normal speed on starting and on a slow-starting projector, for instance, it might be necessary to lace-up the film in the gate at a point about one foot after the ' 'picture' ' frame. To help you locate and remember that point, you should make use of the series of numbers printed on the synchronising leader. These numbers are marked, after the frames marked PICTURE and SOUND, ii, io, 9 and so-on down to 3, after which comes the title or picture.
For example, if a "slow" change-over is made when the PICTURE frame is located in the gate, rehearse with 11 and then with 10, etc., until you find the correct frame for a proper change-over.
The first cue to appear on the screen is known as the motor cue, and the second as the picture cue. The picture cue is located a few frames from the end of the reel in order to allow for slowness in switching off the lamp and sound.
To carry out the instructions above, it will be necessary for the film to be correctly laced and located in the next projector, to have the amplifier already switched on, and the tone and volume controls set in a position similar to those on the projector which is working. But should the next projector be very hot, the reel to follow should not be laced-up until it has had time to cool down — wait until there is about five minutes to go before the change-over. If the film is left in a heated gate for some time it will warp, dry out, and perhaps break when finally projected.
When preparing a projector for a change-over, lace the film from spool to spool but with the required frame a few inches before the gate — the inching knob can then be used to work the mechanism by hand and so bring that frame directly over the aperture. Doing this will also allow you to check the lacing and at the same time it will take up any slack on the take-up and feed. The clutch, of course, must not be disengaged.
Change-overs on Projectors having One Switch Only
One or two makes of silent machines have only a single
switch which controls both lamp and motor, and with these a
slightly different procedure must be followed when changing over.
Assuming that you are about to make the change from No. 1
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