International projectionist (Jan-Dec 1954)

pickup time of the loaded projector. 11. Projection Lens. The projection lens is now carefully cleaned and restored to the projector. For the correct method of cleaning lenses refer to "Coated Lenses: Nature and Care" A. (UUI Anyone can afford the NEW Ace-Griswold HOT SPLICER Made in all sizes. Heat is in the cutting bar only— not all over the machine. Priced at $65.00 We can rebuild your old Griswold splicing machine into the NEW Ace-Griswold HOT SPLICER Write for details to ACE ELECTRIC MFG. COMPANY 1458 Shakespeare Ave. New York 52, N. Y. CAMERA EQUIPMENT CO., INC. 1600 Broadway New York 19, N. Y. by A. E. Murray of the Bausch & Lomb Optical Company (IP for February, 1949, p. 7) . So comprehensive is Dr. Murray's contribution to this phase of the projection art, that the subject is dismissed here with the oft-repeated admonition ; NEVER "scrub" lenses; NEVER wash lenses in alcohol or other organic solvents! Failure to heed this warning may ruin a fine lens. lamp & Ventilating System 12. Lamp and Ventilating System. The interior of the arc lamp may be so dirty that much time and effort will be required to clean it out. The presence of carbon stubs in the carbon holders is mute evidence of the laxity of the projectionist's predecessor. If the vent pipes appear to be clogged with carbon dust and oxide fluff, take them down and clean them before cleaning the lamps. In any event, the effectiveness of the ventilating system should be tested long before an arc is struck. Invisible gases produced by electric arcs are highly poisonous. As a rule, low-intensity get grimier than high-intensity lamps. Oil-caked carbon encrustations are frequently N EW "MOVIES ARE BETTER THAN EVER" V/ I T H f/1.8 I L U X v\^ith the brightest clearest picture -k NEW ANASTIGMAT FORpiA •k ONE PIECE HERMETICALLY SEALED MOUNT ■k NO CJEMENrFAILURE-NO RECEMENTING ^^ -^LITaIR-GLASS SURFACES PRO-COATED ir MINIMUM VIGNEHING ic MAXIMUM SCREEN BRIGHTNESS P R 0 J E tTT ION OPTICS COMPANY, INC. 3 30 LYELL AVENUE • ROCHESTER NEW YORK the cause of faulty mechanical action. The roof of the lamp should be cleaned first, and all ash removed from the vent. Then the floor may be brushed free of dust. Grease, graphite accumulations, etc., may be washed with kerosene from the guide rods, feeding screws, and reflector gearing. After cleaning, lubricate all moving parts of the lamp according to the manufacturer's instructions. Lamp Electrical Units 13. Lamp Electrical Appliances. Burnish the contact surfaces of the carbon holders. If light filing is necessary, use a magneto file, taking care to preserve the flatness of the surfaces. Then give them a final polishing with crocus cloth. Test the clamping action of the carbon jaws, and give rotating-positive feeds extra attention. Electrical connections to the carbon holders, are relay, feed motor, etc., must be secure. It is not uncommon for as much as 3 amperes to be lost through faulty carbon-holder lug connections. The lost current is converted into heat which aggravates the troubles by accelerating corrosion of the metal. The condition of the flexible asbestos-insulated cables must also be checked, for these cables, being composed of many fine strands of wire, are particularly liable to oxidation. The cut-out points of arc relays may be touched up by drawing 00 sandpaper between them while lightly pressing them together. (For routine cleaning use heavy writing paper in lA ELECTIONS LOCAL 162, SAN FRANCISCO, CALIF. Norman E. Maynahan, pres.; William Van Ornum, vice-pres.; Herman J. Lehrbaoh, sec.-treas.; Larry H. Weaverling, bus. rep.; Jesse Lunsford, sgt.-at-arms ; W. Van Ornum, James T. Luther, St., Paul G. Zern, Oscar Brostrom, Antone J. Salami, exec, board. LOCAL 433, ROCK ISLAND, ILL. Edward A. Short, pres.; Richard T. Murphy, vice-pres.; George A. Stoddard, recsec; Kenneth L. Benedict, fin.-sec; Lloyd Burrs, treas.; Fred R. Parker, bus. rep.; Albert B. Adams, sgt.-at-arms; Roy L. Blubaugh, Frederick R. Mauck, trustees; F. R. Parker, exec, board. LOCAL 488, HARRISBURGER, PENNA. Lawrence J. Katz, pres.; Charles J. Jones, vice-pres.; E. Richard Bennett, sec; Paul F. Paterson, treas.; Sam Rubin, bus. rep.; Charles Zinn, sgt.-at-arms; Paul N. Hippie, John L. Bruner, exec, board. 30 INTERNATIONAL PROJECTIONIST APRIL 1954