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 June, 1963 No. 6 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 XeTRON Lamp System 4 Xenon Projection Lamps 6 By ROBERT A. MITCHELL New South Carolina Theatre 12 London's Empire Theatre 1' News Notes — Technical Hints — Miscellaneous Notes MONTHLY CHAT CLEAN EQUIPMENT MINIMIZES TROUBLE The clean equipment minimizes extra work, as the projection craftsman well knows! Electrical devices, unlike wine, do not improve with age. One of the essentials of electrical circuits is to maintain the flow of electrical energy in the circuits, and if permitted to stray by dust or dirt, only trouble will result. Only a routine cleaning of the electrical contacts can avoid extraneous interferences in the sound system. A surge of noise at the inopportune time will ruin the finest picture, and the same holds good for faulty projection. If the craftsman has years of experience, he knows that dirt or dust allowed to collect on his equipment means trouble ahead, and wasted time at an inconvenient time. The \eteran craftsman is not a philanthropist. He can be selfish, knowing that such painstaking methods for cleaning his equipment means he doesn't have to work so hard at sen icing dirt] machines. Atmosphere and Oxidation \tmopsherc attacks the terminals, causes oxidation, and oxidized terminals mean poor contacts. Unboxed tubes kept on the shelves for months should be cleaned, else when the tubes are placed into the socket the contact is poor between the tube and socket prongs. The veteran projectionist has a routine check-up of all of his equipment, including a check of sound amplifiers, sound heads, corrosion on all switches, all tubes (the} do not leave any doubtful lube in service), lenses, lamp reflectors, condensers and fuses, and many other parts of his machines. Hell tightl) close the oil cans so atmospheric moisture cant condense in the lubricant i main cases of rusting equipment are traced to that condensed in open oil cans). And he can't take chances on fire, from time to time he'll inspect the film cabinet to make sure it is still in A-l condition, and he will periodically inspect the rectifiers, generators or other apparatus located outside the booth. 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 Stores, 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. 1 International Projectionist June 1963 Dust Deteriorates The usual thing is a painted floor in the projection room, and when the paint is worn to the point that walking on the floor will scuff concrete dust into the equipment, the projectionist has an insurmountable task. The effect of dust upon electrical apparatus is of greater importance at the seashore, where the atmosphere is very moist. The new and older large installations, carry all wires though conduit, but in many cases with open wiring the wires develop puncture due to moisture absorption. The projectionist cannot coordinate electrical disturbance with dirty equipment. The projectionist should take a firm stand with the exhibitor or the manager if dust gets in the booth. He is powerless to keep the equipment clean. And why should the exhibitor permit dust and dirt on his own equipment — assuming his projectionist cleans the equipment regularly? iP