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1356
EXHIBITORS TRADE REVIEW
Volume 11. Number 19
dowser (F-3) and the automatic fire-shutter. An image of the filament will be projected on the automatic fire-shutter through the pin-hole (F-7). The fact that the image is off center with respect to the aperture does not indicate that the line-up is incorrect.
Loosen locking knob (Q-2, Fig. 22) and move the mirror (H) forward or backward by means of focusing knob (Q-1) until the mirror or image of the filament as projected on the fireshutter is exactly the same size as the filament image (Fig. 23). Turning the focusing knob (Q-1) clockwise will make the mirror image smaller; turning it counter-clockwise will make it larger.
After the mirror image is of the same size, move the focusing knob (Q-1) to and fro, up and down until the mirror image of the coils meshes into the open spaces between the filament coils, thereby making a uniform source of light. Then clamp the mirror in position iby tightening locking knob (Q-2, Fig. 21).
Parts of M/rror Ho/dar
Fig. 2J fiow to Mash Mirro r Im aga
If this lamp be; now removed, and another lamp (correctly setup in the same lamp-setter) be inserted, the mirror will mesh correctly as before; but if it does not fall exactly between the filament coils, move the mirror slightly one way or the other
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until the fault is remedied but do not touch the lamp socket or the adjusting screws (N-1 or S-1).
ADJUSTING FOR STEREOPTICON PROJECTION
To adjust for stereopticon projection push the carriage (B) over on its track (C-1) against the stop (C-8). Then pull the motion-picture condenser mount (F) over until the stereopticon stop (P-6) hits condenser stop-screw (A-4) on the lamphouse. Bend back the motion-pictui-e condenser mount (F) on its hinge (F-1) against the lamphouse until the stop (F-4) engages in latch (A-7).
The setting of the lamp with respect to the plano-convex condensing lenses is done by moving the stereopticon condenser holder (P-1) backward and forward until the field is clear instead of moving the lamp itself to and fro as is the case with the carbon arc. The distance for the lamphouse carriage (B) to be moved over may be controlled by loosening the set screw (B-4) and by varying the distance of the stereopticon positionpin (B-3) to the stop (C-8).
(Continued next week)
THEATRE SPECIALISTS 8^eK?^tSLvtres C. HOWARD CRANE, Architect
ELMER GEORGE KIEHLER, Associate CYRIL E. SCHLEY
DETROIT CLEVELAND CHICAGO WINDSOR, ONTARIO
"It is another of the BRENKERT MAKE Products" Is the Chorus from Satisfied Users of
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