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audience, and where possible they should be set upon a large table. Many operators prefer to project from a stage or platform, and in many village halls the platform is used as a readymade operating box, the curtains being drawn to within a foot of each other or closed around a hoop, and through which the picture is projected onto the screen at the other end of the hall.
The Mobile Operator
The layout of the equipment will vary from hall to hall, and it should be remembered that in some a great amount of work will have to be done in preparation for the show. Mobile operators should therefore set out in good time, and if possible reach the hall at least one hour before starting time, and immediately report their arrival to the person in charge. It is quite possible that black-outs are missing from the windows, chairs have to be arranged or even collected from elsewhere and a number of other arrangements made before the operator can make a start on his own equipment. In such cases as this it will depend on the operator's own position and standing, which will determine whether or not he should have to do the work himself. It is no good arriving an hour before the show is due to start if there is an hour's work to be done in the hall first, but the moral, of course, is to see about it the day before.
The hour's grace before the show should be used for setting up the equipment, and carefully checking it for the correction of any faults. For public exhibitions even more time is wanted, and everything should be ready in time for the opening, in most cases about half an hour before starting time (Fig. 19).
After reporting his arrival, the operator should next check the voltage by looking at the meter, irrespective of the fact that he may already have been told what the voltage is. (But don't act as though you do not believe the person supplying the information. The point is, that it is the responsibility of the operator to make absolutely sure that the voltage is correct for his equipment.) The author was once told, most emphatically, that the mains supply was D.C., and having no reason to doubt his informant, he accordingly rigged up his rotary converter. However, the day before, the local electricity company had changed over to A.C., a fact which no one seemed to know
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