International projectionist (Jan-Dec 1957)

devoted entirely to lectures and film presentations on Training, under the supervision of Dr. Robert Lloyd Cantor, director of Training for the Ronson Corp., and a member of the board of directors of the American Society of Training Directors and National Visual Presentation Association. Taking the recent exhibition as a barometer, industrial A-V should be due for a sharp upswing in its already ascending business curve. Considering that some small confusion existed at the exhibition because it was the initial conclave, there seemed to be little doubt that the importance of A-V techniques to the industrial world will be given increased consideration. What is significant is the fact that the exhibition denoted a concerted effort on the part of manufacturers, managers, directors and others. Particular credit should go to the National Visual Presentation Association, under whose auspices the exhibition was held. TOA-TESMA REPORT [Continued from page 29) A. J. Piatt, RCA; Edwin Wagner, Wagner Sign Service Co.; Fred Wenzel, Wenzel Projector Corp.; and Marty Wolf, Altec Service Corp. Equipment-wise, the year's new developments were featured, which have been duly detailed in this magazine throughout the past twelve months. A few significant touches were evi mm as dent: National Theatre Supply exhibited North American Phillips (ToddAO) equipment; Century Projector is manufacturing the equipment for the Cinemiracle process which received quite an accolade at its trade showings in Los Angeles and New York; Simplex Equipment Corp. exhibited its new 5-to-l intermittent movement which was the feature of last month's IP; and the new "WISP" wireless sound speaker for drive-ins was being plugged by Vido-Sound Corp. There is, obviously, not room here to detail all the new and fine equipment that has appeared in the last year. But, since it has not been mentioned publicly yet, IP should like to inform the California Chamber of Commerce ... it rained. SIDE-WEAVING: COMMON PROJECTION DEFECT (Continued from page 11) of whatever "green" (brand-new) prints that may be received at the theatre. Unless treated with very special care, green prints show up sideweave very prominently, especially if they be CinemaScope films requiring anamorphic lensing with a doubling of the horizontal dimension. When projected at even moderate arc currents, fresh prints are likely to "stick" as they pass through the hot projector gate. A sticking prints chatters loudly in the projector and has fits of jumping violently on the screen. (The jumping is caused by slippage and overshooting on the intermittent sprocket.) Severe sticking may injure the sprocket holes of the film. Sticking is caused by the melting of fresh, moisture-laden gelatine emulsion and its deposition upon the gate runners where it hardens and interferes with smooth passage of the film. Hardened gelatine deposits often cause a line to be scratched longitudinally along the middle of the perforation area on each side of the film — telltale evidence of sticking. Adequate waxing of the film by the exchange or the processing laboratory largely obviates sticking and consequent film damage. Waxing is frequently inadequate, however, forcing the projectionist to oil the film for smooth running. Squirting oil all over the surface of a green print, or even applying lubricant to the margins of the film as it runs through the projector, is not good practice. The print becomes soiled, picks up dust easily, and produces a flickering, mottled appearance on the screen. Moreover, the heat of the arc lamp vaporizes the excess oil and causes it to condense as a fog of oil droplets upon the rear surface of the lens. The picture then becomes dim and hazy, and the heat absorbed by the film of oil may crack the lens. Whenever it becomes necessary to lubricate a print in the projection room, wipe both sides of each roll of film with an oily cloth, following the curvature of the convolutions. (This may be done through the openings in the sides of aluminum and weldedwire reels.) Enough oil will seep into the perforation margins to prevent sticking without making the print messy; and because the oil is applied to both edges of the film, the severe side-weaving caused by oil on alter J PUCES _ NOT } HOLDING i Film breaks are costly. Play safe by using JEFRONA All-purpose CEMENT Has greater adhesive qualities. Don't take our word for it. Send for FREE sample and judge for yourself. CAMERA EQUIPMENT CO., INC. DEPT. J 315 West 43rd Street New York 36, N. Y. JUdson 6-1420 BRIGHTER LIGHT LONGER BURNING SHARPER PICTURE Free Test Samples m*^ avtacne TT?»»M»»f»l &Vl6<M4, CARBONS INC., BOONTON, N. J. 1 tl^i*li Mltllllllll I JtlM • * I STEADIER LIGHT LESS ATTENTION PERFECT COLOR BALANCE Free Carbon Chart INTERNATIONAL PROJECTIONIST • DECEMBER 1957 37