International projectionist (Jan-Dec 1945)

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LaVezzi Machine Works 180 NORTH WACKER DRIVE CHICAGO 6, ILLINOIS Ljreefinad • and (/Jest lA/idhed < > Sister Locals in the I. AT. S. E. • MOVING PICTURE < MACHINE OPERATORS' UNION LOCAL NO. 364, AKRON, OHIO JOHN (JOHNNY) A. SHUFF ; Business Representative ', : JOSEPH M. MENHORN LOUIS L. LEVE ; President Secretary ', J You Can and Should help yourself by investigating the ASSOCIATED ELECTRONIC ENGINEERS— a society of union Theatre Sound Engineers whose members are represented in 129 Local Unions of the International Alliance. R. W. KAUTZKY For information write to 4106 CASE ST. ELMHURST, L. I., N. Y. PROJ. LIFE OF FILM (Continued from page 15) the wearing property was not satisfactory. In a repeat test, it was much better, and when applied to both sides of the film, it was better than that of the edge-waxed sample. It is admitted that the application of wax to both sides of film may present other problems — such as difficulty in splicing, etc. Any simple wax application depends for its effectiveness on the principle that the treated surfaces will be more resistant to abrasion than those not similarly treated. Whereas this is true in some cases, as seen in Table I, the fact remains that no practical film surface has been found which will resist abrasion indefinitely. Therefore, when these treated surfaces become abraded, they present the same problem as do any other scratched films. We may distinguish, then, between the resistance offered to abrasion by a simple lubricant and the protection of the film surfaces from abrasion by a thicker coating, such as a lacquer. In addition, it is necessary not only to have the lacquer coating of such a thickness that it will carry the abrasion which normally is borne by the film surfaces, but, to be really effective, it must be removable and renewable. Thus, at any time in the life of the film, the entire external surfaces of the film can be renewed. Only in this way can "new print" quality be maintained. Conclusions It has been shown that an increase in the wear life of film will result if the diameter of the intermittent sprocket is increased from 0.935-in. to 0.943-in. This fact has been demonstrated many times by laboratory tests. The results in the laboratory have been verified by trade tests in which it has been shown that the 0.943-in. intermittent sprocket will give from 2 to 3 times the number of' projections, before breakdown of the film, as the 0.935-in. sprocket after each sprocket had been in theatre use for over 1500 hr. Laboratory tests indicate that a decrease in gate tension would increase the wear life of film severalfold. The centering of the perforations on the intermittent sprocket has a considerable bearing on the wear life of film. Mention has been made of the necessity for the reduction of the damage to the edges of prints. Two methods by which this damage can be minimized have been described. Abrasion of the surface of film can be reduced by the application of wax to the entire surface. Surface abrasion 26 INTERNATIONAL, PROJECTIONIST