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justed (before the start of the show) to give sufficient light for the coloured film, care being taken to see that the voltage does not exceed the limit of the lamp's rating, i.e., a no-volt lamp may be run at 115-volts, but only for short periods, and only when absolutely necessary for better lighting. It is not advisable to do this, however, unless you have a spare lamp at hand, as over-loading the lamp considerably lessens its chance of survival after middle-age !
Another thing to remember is that coloured films may have the emulsion on either side, and it is impossible to foretell on which side it will be until you are able to examine the film. Coloured films must therefore be watched in relation to the sound, for the scanning beam is finely focussed on one side of the film only — the emulsion side. Re-focussing the projection lens is nearly always necessary, but to alter the focussing of the scanning beam is something which should not be attempted unless the operator is sufficiently skilled, or is positive that the cause of low sound is not due to something else — a print with a low recording level, for instance. Any alteration to the soundoptical system must be carried out with extreme care and gentleness, as the slightest adjustment either improves the sound or entirely eliminates it, and both the operator and the audience are thus likely to be surprised.
The use of coloured slides call for the same precautions as with films — sufficient light, and refocussing whenever necessary. But always attend to the voltage BEFORE the show.
At the End of the Show
Immediately after the end of the performance, switch off and disconnect the mains lead. If the equipment is then to be packed up and taken away, next follow this routine: —
Wind up mains-cable
Disconnect and wind up speaker-cable
Lower and pack-up screen
Count and pack films
Count and pack spares
Fold or disconnect spool-arms on projector
Put all switches at "Off" and controls at "Zero"
Lower projector tilting-device You will notice that these instructions require you first to
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