International projectionist (Jan 1943-Dec 1944)

TO PROJECTIONISTS: Here's RCA Service Company advertising directed to your management and appearing in leading theatre trade magazines. BUY MORE WAR BONDS YES, they're probably eating up every word, too, because that RCA Projectionists' Handbook is packed with good information on the care of theatre equipment. Theatres all over the country have ordered this 76-page manual, prepared by our experts in theatre service, because they realize the importance of preventive maintenance . . . preventive maintenance to prevent costly breakdowns. *Very fictitious names, of course Care of your equipment will continue as number one on your "must Zi5f." That's why we urge every theatre manager to back his projectionists in setting up a preventive maintenance program at once. Your projectionists are doing a swell job — Mr. Manager — and deserve your utmost cooperation. Send the coupon today! Address : RCA Service Company Inc., Box 70-77D, Camden, New Jersey. RCA SERVICE COMPANY, INC. A Radio Corporation of America Subsidiary RCA SERVICE CO., Inc. This 76-page manual "RCA Photophone Handbook for Projectionists" — chock-full of good preventive maintenance suggestions. No obligation. Box 70-77D, Camden, N. J. Name, Theatre. Address. City _ State. location and wired to the a.c. supply of the rectifier and to the heater contacts of one of the two tube sockets. The other socket remains wired standard except for the plate connection. The plate circuit is carried through a double-pole double-throw toggle switch mounted on the front of the chassis so that it doesn't interfere with the cover and is wired to the plates of the two rectifier tubes. The circuit wiring details are readily apparent. In operation the filament of one tube is energized while the other is in use. A change can be made instantly from one rectifier tube to the other by throwing the toggle switch without the loss of a word. The projectionists are instructed to run on one rectifier tube for a week and then on the other for a week. Tube life is thus greatly prolonged and tubes are not lost through improper heating. Incidentally, the regular filament plate switch stays in the circuit and is used as intended on starting up and shutting down. I have used this modification for over two years with excellent results. — Ted DeVore, RCA. Rust Preventive Rust prevalent on 959 Universal joints and other steel parts may be caused by condensation during change in temperature. The Delta Machine Company, of workshop fame, puts out a very good rust preventive which sells at 50c a pint. If their rust remover is used before applying the preventive, care must be exercised to immediately replace the oil film which the remover destroys. — Fred A. Manley, ALTEC. Adapting a Western Electric KS-6607 Optical in a Deforest Sound System I found that a Western Electric KS6607 optical system can be used in the DeForest soundheads by removing all elements from the DeForest optical and sliding the complete Western Electric KS-6607 into the DeForest lens barrel. Reproduction from the above modification results in much better sound. — C. W. Stelling, RCA. Rubber Motor Mounting Installation The first time I tried to change a rubber motor mounting I really did sweat, bruised my fingers and lost my temper. The next time I took a pair of ordinary "C" clamps, hack-sawed the back of them a little so that they went through the end bell holes. In this way the end bell can be hung over the side of a bench and the clamps tightened on opposite sides of the clamping plate against the rubber cushion. Equal pressure is exerted on each side and the wire retainer can easily be slipped in or out of the groove with a screw driver. — Ted DeVore, RCA. A Friendly Tip The Projectionists' Service Manual, published by I. P., now off the press about a month, has proven the book of the year to the craft. Heavy mail orders have been received for it singly and in bulk. Apparently most projectionists want to be assured of their copy. The limited edition, however, is fast dwindling, and as there will be no second edition this year at least it is not amiss to caution those who still have not ordered the manual to do so now. 28 INTERNATIONAL PROJECTIONIST