International projectionist (Jan 1963-June 1965)

INTERNATIONAL PROJECTIONIST Including a special Audio-Visual section relating to the operation and maintenance of A-V equipment in the educational and industrial fields. Volume 38 May, 1963 No. 5 FRANK W. COOLEY, JR. Editor and Publisher RAY GALLO Executive Publisher AL BLOOM Managing Editor TOM KENNEDY Equipment Editor RAY GALLO ASSOCIATES National Advertising Representatives 545 Fifth Avenue, New York 17, N. Y. Telephone Murrayhill 7-7746 (Area Code 212) IN THIS ISSUE Good Sound for Dnve-lns By ROBERT A. MITCHELL The Cover Story Exhibitors Must Remodel Core-Lite Evaluations New Century Projector News Notes — Technical Hints — Miscellaneous Notes 10 12 13 14 INTERNATIONAL PROJECTIONIST, published monthly by the International Projectionist Publishing Co. division of The Northern Publishing Co., Post Office Box 6174, Minneapolis 24, Minnesota. Editorial offices, 1645 Hennepin Avenue, Minneapolis 3, Minn. Subscription Representatives: AUSTRALIA— -McGills, 183 Elizabeth St., Melbourne; NEW ZEALAND — Wixon's, Ltd., 64 Courtnay Place, Wellington; ENGLAND and ELSEWHERE — Wm. Dawson & Sons, Ltd., Macklin St., London, W. C. 2. Subscription Rates: United Stotes, Canada, and U. S. Possessions, $3.00 per year (12 issues) and $5.00 for two years (24 issues). Foreign countries: $4.00 per year and $7.00 for two years. Changes of address should be submitted four weeks in advance of publication date to insure receipt of current issue. Second-class postage paid at Minneapolis, Minn. INTERNATIONAL PROJECTIONIST assumes no responsibility for personal opinions appearing in signed articles, or for unsolicited articles. Entire contents copyrighted 1963 by INTERNATIONAL PROJECTIONIST PUBLISHING CO. MONTHLY CHAT Craftsman Taken for Granted The projection booth houses the most expensive theatre equipment, and the projectionist rules over this costly inventory. The theatre owner or the house manager have not the skills to adjust and clean the booth equipment. That's up to the projectionist. The good craftsman treats his machines like a baby, because he knows he is in charge of costly machines, and that dust grinds down his delicate parts in his equipment. Electrical contacts get dirty, so he cleans them. The lamp reflectors get pitted and grimy and the lamphouse must be cleaned. \nd the same goes for the sound system with its electrical contacts. The booth craftsman has the responsibility for the inventory of spare parts and outside service, if needed to repair the equipment under his care. To insure proper and smooth operation, all projectors should be kept clean and well lubricated and in proper adjustment. Cleaning should be carried out as a daily routine. Otherwise the hardening of lubricating oils under the heat of the projection lamp will bake onto any surface, and that is difficult to remove. The modern projector requires very few adjustments, but the daily routines of the hoothmen are an important chore. They include the timing of the shutter, focusing the lens, proper tension of the film path and other parts of the projector. The condition of the projector and soundhead sprocket teeth should be carefully inspected at frequent intervals, and if there is any visible undercutting of a small notch at the base on the contact side of the teeth, the sprocket should be replaced, as any teeth considerablj reduced in width at their base will cause an unsteady picture and will damage the sprocket holes in the film. The lamp optical surfaces should he kept clean and a regular routine before the day's program begins is a must, feed relay contact points should be checked regularly, and cleaned with fine sandpaper if any sparking is visible. Persistent arcing across the relay points is the warning sign that the resistor bridging has deteriorated and should be replaced. If the relay contact is faulty then noise gets in the sound system. This calls for cleaning the relay points and adjusting the tension, and in extreme cases for installation of filter condensers connected with either across the points or from each point to ground. All moving parts of the lamphouse should be carefully lubricated. Rectifiers of the bulb type requires these procedures: keep the rectifier clean and dry, clean the bulb and socket contacts periodically with 00 sandpaper, keep all connections tight, pre-test all spare bulbs. The soundheads must be kept clean, and the face of the photocell must be optically clean; any oil should be thoroughly cleaned off or it will attack the rubber insulation of the photocell wiring. Those are a few fundamentals which projectionists well know, they are cited here because the theatre owner or the house manager does not have the skills and knowhow that the projectionist has to know about this complex machinery before he goes on the job. (Continued on Page 9) International Projectionist May 1963