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The Cover Story . . .
XeTron Projection System
A highly-profitable summer at the Grove Theatre, Texas A & M University, College Station, Texas, has been translated into better business in Guion Hall at the college. This installation shows motion pictures before college students and gives some employment to local projectionists.
Texas A & M University is the largest military school in the United States, with 8,320 students. Guion Hall seats 2,150 and has shown three motion pictures a week. 90% of the films have been 35mm and 10% 16mm in the past but with this new equipment they now plan to produce 16mm exclusively because of the great improvement in the equipment. The projectors feature the XeTron light source installed by Carbons, Inc. Boonton, New Jersey.
"With this new type of lamp, the picture will be more than three times brighter than our old 1200 watt bulbs," said Wallace Johnston, student program advisor.
Here is the lamp house of the JAN projector, together with the various parts used in the modification, an unusual application for 16mm motion pictures, according to Frank H. Riffle, president of Carbons, Inc.
This illustration shows the modified JAN projector using the XeTron Kit by William Spooner. The letters and arrows illustrate the areas in which Mr. Spooner made mechanical modifications to the JAN projector.
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The Texas A & M installation is a ■ very interesting application of 16mm projection as it is a large auditorium with a seating capacity of 2,150.
Previously 90% of the films were 35mm because the 16mm equipment was unable to provide the necessary screen brightness. The screen size for the 16mm presentation is 24x17 ft., which is a real test for any 16mm projector.
The Bell & Howell JAN projectors were modified by William Spooner, representing the XeTRON Division of Carbons, Inc. The results have been so outstanding that the decision has been made to use 16mm prints on as many showings as possible. It is estimated that in the future,
90% of all feature pictures will be with 16mm prints.
The actual modification of the standard JAN projector can be made in about one hour. This permits the attachment of the XeTRON lamphouse and its easy removal for transporting. This lamphouse contains the necessary high voltage starter unit plus a front coated reflector and associated adjustment controls.
If the projector does not have t ie standard two blade shutter, it should be used, otherwise maximum serf brightness will not be obtained.
The Osram 450 watt Xenon bulb operates in the range of 23 to 28 amperes, and by careful design of the reflector very good overall
efficiency is obtained. The arc voltage for this bulb is approximately 20 volts after ignition. As the quartz envelope is filled with Xenon gas. under pressure, a 30.000 volt pulse is supplied at the instant the start button is depressed. This ionizes the gas and allows the initial current flow.
The projected light is of the high intensity type and compares favorably with that of the small carbon arc operating in the 28 to 30 ampere
International Projectionist March. 1965