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time the picture-frame is corrected. And the framing (or racking) must be corrected immediately a frame-line shows upon the screen.
The focus, of course, also demands constant attention. The objective is usually fitted into a mount which is actually a part of the gate assembly and there is always a tendency for the gate to open slightly each time a join passes through it, which then results, perhaps, in the need for refocussing, but first ensure that the gate is still properly closed. Another thing to check is the tightness of the lens within its mount — if the lens is loose you may have to keep re-focussing throughout the whole of the performance.
Discolouration suddenly appearing on the screen is usually a warning that a lamp is about to fail, that the voltage has dropped, or that the lamp has shifted slightly out of alignment. Do not touch the lamp setting-screws unless they are easily moved as exterior controls, check the voltage to seen that the lamp is not being underrun, and get another lamp ready for replacement.
If the picture suddenly or slowly becomes brighter, at once check the voltage to see if there has been an increase. A similar warning of excess voltage will be given by an increase in volume from the loudspeaker.
Dual Projection
The term "changing-over" implies the switching over from one projector to another in order to maintain continuity of a performance.
The two projectors are set up side by side, the distance between them being as described in Fig. 27.
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Fig. 27
DUAL PROJECTION The distance between projectors equals the length of your forearm plus one or two inches.
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