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precautions against back radiation. It is an effect most noticeable by its absence.
Sound Apparatus
Projector well back, speaker well up. That summarises the advice so far and with a sound-on-film projector, little more need be said. But when you use tape or discs to provide the sound, you must still decide where to put the additional equipment.
Beyond doubt, the ideal is to have all your apparatus compactly arranged. If you are running the show singlehanded, it is essential to have everything within arm's reach. Even when with an assistant, you cannot spread yourselves much more if you are to keep closely in touch with each other.
Occasional exceptions arise, of course. We noted some of these when we were discussing simple ways of using discs. Another example arises when you have no extension speaker for the tape recorder. In this case, you have little choice but to place the recorder close to the screen. Your tape must then begin with play-in music lasting a minute or so. This enables you to start the tape and walk back to the projector without haste. Start the projector at a selected point in the music so that the film and commentary will appear in correct synchronisation.
When space is limited, you may begrudge the space required for the twin turntables used for the provision of sound from discs. Equally the turntable operator will resent being cramped for space since he needs plenty of room to lay out his discs before and after playing them. A possible solution lies in putting the sound apparatus somewhere at the side of the screen, or even behind it. This may mean arranging a mirror so that the turntable operator can tell what is happening on the screen, but he can get along with a view much inferior to that which the audience expect.
However carefully you rehearse the show, it is helpful to have a simple system of signalling between sound operator and projectionist. You can easily contrive a suitable device
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