International projectionist (Jan-Dec 1945)

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NEW THEATRE AMPLIFIERS GREATER Tone Awuracy with Symrofilm New Theatre Amplifier Electronically Correct Syncrofilm Theatre Amplifiers and Sound Heads represent the modern way to theatre sound perfection. With an undistorted wattage output, Syncrofilm Theatre Amplifiers utilize many new and improved features that have heretofor been unobtainable in the amplification of high quality sound. Syncrofilm Theatre Amplifiers are supplied in two models of 60 and 20 watt output, designed to meet your exacting amplification requirements. Weber Machine CoriBnration 59 RUTTER ST., ROCHESTER, NEW YORK Export Office: 13 E. 40th St., New York, N. Y. Cable: ROMOS Manufactured by LAKEWOOD AUTOMATIC SWITCH CO. Lakewood, Ohio Distributed Exclusively by NATIONAL liHIIIMHtl Divit.'on t,l No.ionnl • 5 i m p le ■ • 8 I vj d wo., h. I n ^MsdirufA. LOCAL UNION NO. 407, I. A. T. S. E SAN ANTONIO, TEXAS the Society in 1933 and which was published in the January 1934 issue of our Journal. However, on the basis of that I issued a preemptory order to our Engineering Department to change all intermittent sprockets from 0.935-in. to 0.945-in. diameter which we promptly did and probably shipped several thousands. Shortly thereafter we were called upon to replace sprockets for the reason that there was a noise regardless of what the previous speaker said. A noise would show up from a slight undercut of the pull-down tooth. We replaced all of the 0.945 sprockets. I agree that in those days the shrinkage problem was more acute than it is today. However, that situation did exist with the result that we were called upon to replace thousands of sprockets. Our company is in business to make money and cannot continue to replace sprockets. The projectionists just would not use them. I agree with the gentleman who said it would be a wise plan on the part of the film manufacturers to supply the sprockets themselves, but I don't think that would work either, as they would have the same problem and the same results. Anybody like to rebut that? Mr. Talbot: May I ask you one question? Are you sure that those sprockets used at that time were hardened steel or were they soft steel? Mr. Griffin: They were hardened and ground steel. The radii were ground also on all of the teeth and still are. Mr. Talbot: The only thing that I can say, more or less in rebuttal, would be that if these sprockets have been in use for approximately one year and still give double the life of film, it would pay the exchanges to replace the sprockets today if they had to. I mean, if after a year they are still getting better runs, even if it were true at the end of a year the sprockets began to wear and had to be replaced, it would still seem worth while for the exchanges to do this rather than have to buy so much film. Mr. Griffin: With that I heartily agree. Nevertheless we had to shoulder the burden and would not want to have to do it again. I still want to recommend a 0.943-in. sprocket. Mr. E. J. Denison: Regarding edge damage to film, mentioned in Mr. Talbot's paper, it has been my experience over a period of years covering film exchanges that a great deal of the edge damage is actually done during rewinding of the film in the exchanges and not by projectionists or projection machines. If one will visit the average film exchange today he will find that rewinds are badly out of alignment, with the result that the film traveling from the free-running reel to the rewinding reel is drawn across the side of the rewinding reel, resulting in the film being broken through from the outer edge to the perforations. Further, the out-of-line setup of the rewinds results in some convolutions of the film protruding from the side of the roll. When one reel is stacked on top of another during handling by the film shipper or truck driver, these convolutions which protrude from the roll are broken down by weight, resulting, 28 INTERNATIONAL PROJECTIONIST