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MANAGERS AND PROJECTIONISTS 943
of knob D, Fig. 366, until the proper height is obtained (which should be the center of fire shutter). This image must then be focused by turning knob A, Fig. 366, forward or backward until clear definition is obtained. This image after the best definition has been obtained must be moved horizontally and so placed as to fill in the dark places of the lamp image and locked by means of knob D, Fig. 366.
Next by turning knob A, Fig. 366, the mirror image is made as sharp as possible and then, using knob C, Fig. 366, which swings the mirror sidewise, and knob D, Fig 366, which causes the image to raise or lower, so locate the mirror image that it exactly fills the space between the filament coils, so that the image appears as at B, Fig. 367.
The entire adjustment should now be complete and correct, and the screen field should be clear. Should there be discoloration, slowly move the entire lamphouse backward or forward until it disappears, after which tighten wing-nuts (two of them) R, Fig. 358.
EXTRA LAMPS. — It is necessary, or at least highly advisable that one or more extra lamps be on hand, adjusted in spare lamp holders and all ready for immediate insertion in the lamphouse. Failure to take this precaution may, and probably will cause an embarrassing situation as the audience waits while you install a lamp in its holder, and the holder in the lamphouse, the first named proceeding probably requiring a longer period of time than the second.
INSTALLING EXTRA LAMP IN LAMPHOUSE.— First, before attempting to remove the old lamp, be sure the projector table switch is "Open." Then, having the spare lamp properly installed in its socket, as per instruction already given, loosen thumb screw, G, Fig. 366, and pull old lamp and its holder out, after which insert the holder with new lamp as per instruction : "Placing Lamp in Lamphouse." Next close projector table switch, bring lamp up to normal amperage, center filament image on automatic fire shutter and mirror image between coils. Resume projection, and if necessary, move lamphouse backward or forward to get as clear a field as possible until opportunity is had to complete a perfect adjustment.
NOTE. — If current be D. C. move regulator to "Low" as soon as projector table switch is pulled. If current is A. C. set regular line voltage switch at "LOW" as soon as table switch is pulled.