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Volume 39
April, 1964
Number 4
Projection
AAAKE-READY FOR DRIVE-INS
By ROBERTA. MITCHELL
PART II
Adequate screen light is the primary concern of the drive-in projectionist. This important problem was discussed in last month's article. Beyond this, and except for the fact that the sound is reproduced through hundreds of individual in-car speakers, a drive-in projection setup is very similar to the booth installation in almost any large indoor theatre. Accordingly, routine cleaning, lubrication, and adjustment procedures follow the same pattern as in any projection room.
Nevertheless, the preparation of the projection and sound equipment for the opening show after months of storage inundates the drive-in projectionist with an immense amount of work to be accomplished in a very shoit time. The numerous make-ready details press for attention just as soon as the equipment has been reinstalled or the wraps removed after the winter's hibernation. Everything must be checked, cleaned, oiled, adjusted, and lined up for top-quality performance.
Much confusion can be avoided and valuable time saved by tackling the make-ready job in an orderly, systematic manner. Assuming that the rewinders, splicing blocks, film bins, parts cabinets, music phonographs, and ventilating equipment are ready for use (important details), the overall job can be broken down into four divisions: (A) Cleaning and Electrical Checking, (B) Lubrication, (C) Adjustments, and (D) Optical Lineup and Sound Check.
The following systematic tabulation of the work to be
done may seem rather overwhelming just to read it through, but keep in mind that many items need only to be inspected and require no outlay of time. The projectionist can therefore literally sail through large sections of the work list, but its inclusiveness insures that nothing of importance will be overlooked. His checkout should follow the general headings of:
A. Cleaning and electrical checking; B. Lubrication; C. Adjustments and D. Optical line-up and speaker check. Following are guidelines for each of these major areas.
A. CLEANING AND ELECTRICAL CHECKING
Preliminary: Check all fuse boxes to make sure that the fuses are secure and unblown, and that spares are close at hand.
1. ARC LAMPS
(a) Vent pipes. Remove deposits of carbon core ash from the interiors of the vent pipes, dampers, and fans. Guard against allowing this dirt to fall down into the lamphouses.
(b) Lamphouses. Brush out all ash and dust from the interiors of the lamps. Wipe the carbon holders with a dry cloth. Never file or sandpaper them! Clean all shafts and bearings, and remove grime from carbonfeeding gears. If the lamps are of the modern rotatingpositive type (Strong), and the manual carbon feed
International Projectionist
April, 1964