International projectionist (July-Dec 1934)

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December 1934 INTERNATIONAL PROJECTIONIST 25 SMALL THEATRES HAVING LOW-INTENSITY ARCS {Continued from page 7) the following rules be strictly observed: 1. Both lamps should be adjusted to an equal load. 2. The gap between carbons should always be the same. 3. Whenever a new carbon trim is requires two or three minutes to build ciater should be allowed before the light is projected on the screen. Usually it requires two or three minutes to build an efficient crater on these low-intensity carbons. 4. All lamps and contacts should be checked for loose connections at regular and frequent intervals. Loose contacts are the cause of much unsteady and nickering lights. 5. Mirrors should be kept clean and protected from the arc flame when the arc is struck. Improper striking of the arc is frequently the cause of poor light quality. Many projectionists just let the positive and the negative carbons touch, turn on the switch and let the current run through for several seconds before adjusting the gap. This method is wholly wrong in that it does not provide the necessary amount of resistance, ordinarily supplied by the arc flame, and effectively prevents the forming of an efficient crater. Striking The Arc Correctly The correct method of striking an arc is to first switch on the current while the carbons still are apart, then to bring them together for only a fraction of a second. This procedure will assure the formation of a good crater, as the carbons are overloaded for only a very short period. It is also important that carbons be kept in an absolutely dry place in the projection room. Carbons absorb moisture very easily, and thus occasion an unsteady and sputtering light. Lamphouse ventilation also deserves consideration. If there be too much draft, the arc flame will be affected and the light will be thrown out of focus. The reason for ventilating a lamphouse is to permit the escape of gases produced by the burning carbons and to permit the entrance of cool air into the lamphouse. Future of L. I. Lamps Low-intensity arc lamps still are used in the majority of theatres throughout the world. Skill and experience made it possible for carbon manufacturers to supply these theatres with a good light at low cost. Thousands of theatre owners and projectionists rely on the efficiency and dependability of existing lowintensity lamps. While it is true that the recent development of new arc types has affected the low-intensity field, it is safe to say that it will be several years before existing low-intensity equipment is replaced in those theatres which are using the smaller carbon trims on low amperages. This being the case, it is imperative that existing low-intensity equipment be afforded every opportunity to deliver the best possible results. There Must be a Reason Equipment acceptance is won in the projection room, not in the front of the house. Projectionist acceptance is what puts over equipment sales — from carbons to sound systems. INTERNATIONAL PROJECTIONIST brings your product face to face with the projectionist. It penetrates right into the projection room, where more than 95% of its total circulation is concentrated. And it's in the projection room where you gain or lose a sale. Picked at random are the following partial lists: I. A. LOCALS 100% SUBSCRIBED 467, Fort William, Canada 188, Kalamazoo, Mich 277, Bridgeport, Conn. 110, Chicago, Illinois 650, Westchester, N. Y 182, Boston, Mass. 386, Columbus, Ohio 405, Knoxville, Term. 437, Brockton, Mass. 414, Wichita, Kan. 143, St. Louis, Mo. 245, Salem, Mass. 421, Herrin, 111. 337, Utica, N. Y. 688, Harlingen, Tex. 203, Easton, Pa. 253, Rochester, N. Y. 647, Cheyenne, Wyo. 199, Detroit, Mich. 272, Cortland, N. Y. 223, Providence, R. I. 492, Battle Creek, Mich. 288, East St. Louis, 111. 486, Hartford, Conn. 490, Elkhart, Ind. 96, Worcester, Mass. OTHER BULK SUBSCRIPTIONS 162, San Francisco, Calif. 154, Seattle, Wash. 509, Duluth, Minn. 173, Toronto, Canada 388, Youngstown, Ohio 303, Hamilton, Canada 191, Cedar Rapids, Iowa 119, Auburn, N. Y. 498, Kansas City, Kan. I. P. distribution blankets America — whether it be in Alaska or Florida, in Mexico or Ontario. I. P. shoots straight at the man in the projection room, the fellow you want to reach. Let it bring your selling message direct to the projection room — where sales are made — and lost.