International projectionist (Jan 1959-Dec 1960)

ings and gears. Some of the newest projectors need no lubrication at all! A complete "oil check" after every 100 hours of operation (once a month, on t lie average) is a safe rule for an old projector. The required tools are a small, long-nosed oilcan and a package of toothpicks. Use a light machine oil if the lubricant sold by the manufacturer of the projector is not available. The oilcan should be used for applying oil to the oil-tubes and large bearings: a toothpick for applying single small drops of oil to the smaller bearings. Oil all of the bearings, including the sprocket and idler-roller shafts, reelarm pulleys, etc. Apply oil to gear teeth with the finger. Some Oiling "Don'ts" Do not use light oil in grease cups. Do not overoil or spill oil into the film gate, on the lenses, or on the sound drum or sound lenses. Carefully wipe off all excess oil. While overoiling increases the accumulation of grime and impairs the performance of a projector in many ways, insufficient lubrication accelerates the wear of mechanical parts and makes the machine noisy in operation. RCA and Kodascope Indiscriminate lubrication of the newer projectors should be scrupulously avoided. Such 16-mm machines as the RCA "400" and the Kodascope Pageant projectors have self-lubricated bearings and normally never need additional lubrication. (When operated continuously, as in preview rooms and TV studios, the RCA "400"' requires 2 or 3 drops of oil after each day of use in each of the two oil holes on the top of the projector above the upper sprocket.) Certain other new projectors require occasional limited lubrication. This should be applied strictly according to the manufacturers' instructions. The following resume has been compiled from I lie official recommendations. DeVry "5" and "15" Units The DeVry "5" and "15" projectors, such as the Model 14000-CC, are completely equipped with "oil-cushioned" bearings which insure long life to the moving parts without the need of additional lubrication. The drive motor is likewise lubricated for life. The shuttle-and-cam intermittent mechanism of the DeVry "5" and "15" is supplied with oil by an oil reservoir which unscrew^ for refilling. Check the oil level in the reservoir periodically and refill as required with DeVry Oil no. 1311I-DA only. A completely filled reservoir may be expected to provide adequate lubrication to the intermittent mechanism for 500 hours — from 6 16 Using Closed-Circuit TV in Education By FRANCIS E. ALMSTEAD Special Consultant on Educational Television New York State Education Department Full utilization of the tremendous potential of the electronic arts will occasion a revolutionary change in teaching methods. This is the opinion of educators who are already using these media of communication, notably the group in New York State whose activities in this field are detailed in the appended first of a series of articles. TODAY the New York State Education Department is conducting a very extensive investigation of all phases of the television medium. Its four experiments in broadcast and closed-circuit TV embrace many techniques and technical arrangements. One of these, a broadcast project, began on September 22nd last over Channel 11 in New York City. These broadcasts may be viewed in four states, eight hours a day Monday through Friday. The viewing area in New York State has a million and a half public school children. In the Regents' broadcasting schedule there are six elementary grade subjects and six secondary school courses. Each of these follows a regular approved State syllabus. Two other experiments are located in State University Teachers Colleges in Brockport and Albany, where closedcircuit facilities are used from grade three through college. These systems use video distribution and a separate two-way audio circuit. The facilities are within a single building at each college. In Cortland County the Department is experimenting with closedcircuit facilities involving three school districts. Schools are connected by coaxial cable and use an independent pupil talkback system. These facilities in four locations are financed by State appropriations and give the Department the greatest undertaking ever attempted in educational communications by one institution. The Educational Objective In Cortland County, New York, educational TV connects three school systems, one in a city and the other two in villages (see illustration). These are directed by two superintendents and three Boards of Education. The superintendents, working in close cooperation with faculty mem months to a year under average school use. A drop of light machine oil should be applied occasionally to each of the external idler-roller shafts of the DeVry with a toothpick. Guard against soiling the sound drum or the sound lenses. Place a few drops of light oil in the oil hole of the takeup drive pulley (top of mechanism case). Victor Animatograph The Victor Animatograph projector, known variously as the "Classmate," the "Assembly," and the "Sovereign," needs only to have its "one-shot" oil tube filled with light machine oil after every 100 hours of operation (1 to 2 months under average school-use conditions), and its reel-arm bearings greased (not oiled!) once a year. Ampro "Premier 40" The Ampro "Premier 40" should be lubricated whenever it has been stored unused for more than 30 days. In normal use, apply 3 drops of Amproil to the central oilwell and to the oilwick in the vertical camshaft bearing after each 15 hours of operation. Apply 3 drops of Amproil to the oil hole at the end of each reel arm. and 1 drop to each of the film guide-roller studs, after each 15 hours of operation. Rotate the rollers in order to distribute the oil, then wipe off any oil which may have fallen upon the faces of the rollers. Bell & Howell Filmosound The Bell & Howell "Filmosound 285" projector has three capped oil tubes on the top of the case. One drop of B & H Projector Oil should be introduced into each of these after every 10 hours of operation. The three sprocket-shaft bearings have felt reservoirs which should be saturated with B & H Projector Oil every 6 months. To do this, lay the projector on its side. Insert the tip of the B & H oilcan in the holes (at the ends of the sprocket shafts) and squeeze the sides of the oil-can 3 times. Place 1 drop of oil on the shafts of the snubber and guide rollers after each 100 hours of operation. Do not lubricate the feed-arm spindle or pulley of the Filmosound at any time, but after every 100 hours of use add B & H Reel-Arm Grease to the grease cup on the end of the takeup arm. INTERNATIONAL PROJECTIONIST • MARCH 1959