Motion Picture Herald (May-Jun 1946)

American Heating & Ventilating Company, 1505 Race Street, Philadelphia, Pa. American Radiator Company. 40 W. 40th Street, New York City. Fedders Manufacturing Company, Buffalo, N. Y. General Electric Company, 5 Lawrence Street, Bloomfield, N. J. Hook Mfg. Company, Sharpsburg Station, Pittsburgh, Pa. Kewanee Boiler Corporation, 1858 S. Western Avenue, Chicago, 111. May Oil Burner Corporation, Maryland Avenue and Oliver, Baltimore, Md. McQuay, Inc., 1500 i^roadway, N. E., Minneapolis, Minn, (heat transfer coils). Mueller Furnace Company, Milwaukee, Wis. Petroleum Heat & Power Company, Stamford, Conn. Sarco Company, Inc., 183 Madison Avenue, New York City. Skinner Heating & Ventilating Company, Inc., 1948-60 N. 9th Street, St. Louis, Mo. Westinghouse Electric Corporation, Mansfield, Ohio. UNIT HEATERS American Blower Corporation, 6001-09 Russel Street, Detroit, Mich. . ' Automatic Gas Steam Radiator Company, 301 Brushtor Avenue, Pittsburgh, Pa. The Bryant Heater Company, 17820 St. Clair Avenue, Cleveland, Ohio. Buffalo Forge Company, 465 Broadway, Buffalo, N. Y. Burnham Boiler Corporation, Irvington, N. Y. Grinnell Company, Inc., 260 W. Exchange, Providence, R. I. Ilg Electric Ventilating Company, 2850 N. Crawford Avenue, Chicago, 111. * McQuay, Incorporated, 1600 Broadway, N. E., Minneapolis, Minn. Modine Manufacturing Company, Heating Division, Racine, Wis. Surface Combustion Corporation, Thomas and Dorr Streets, Toledo, Ohio. The Trane Company, La Crosse, Wis. Unit Heater & Cooler Company, Murray Boulevard, Wausau, Wis. L. J. Wing Manufacturing Company, 154 W. 14th Street, New YorJd City. • INTERCOMMUNICATING HOUSE PHONES TO INSURE the manager's control over every department of theatre operation, and efficient co-ordination of the activities of different departments, suitable methods of signal or communication are indispensable. The simplest are mere buzzer systems, as sometimes used, for example, to advise the projection staff that a change in sound volume is necessary, but the limitations of the buzzer do not allov? different departments to report to the management or permit communication of any but the simplest instructions. House phones for more effective interdepartment contact are used by most theatres. They range in design from simple, two-station communicating lines to elaborate dial systems by which any station can make contact with any other. Loud-talking systems, consisting essentially in distant-pickup with any other microphones and miniature speakers are also adopted to theatre intercommunication. Connecticut Telephone & Electric Corporation, 70 Britatmia Street, Meriden, Conn. S. H. Couch, Inc., Boston, Mass. Dictograph Products Company, Inc., 580 Fifth Avenue, New York City. Philco Radio & Television Corporation, Philadelphia, Pa. • LADDERS, SAFETY THE SAFETY ladder minimizes the risk of accident and of law suits arising from accidents occurring while lamps are being replaced, attraction board letters changed, etc. It is thus a safeguard both to employer and employe. Sizes range from 3 to 16 feet. American Ladder Company, 3700 West 38th Street, Chicago, 111. Dayton Safety Ladder Company, 2337 Gilbert Avenue, Cincinnati, Ohio. Reynolds Corporation, 1400 Wabansia Avenue, Chicago, 111. • LAMPS, A.C. PROJECTION ARC CARBON ARC projection lighting equipment is available for the use of alternating instead of direct current. A component of the equipment is a rotary transformer which alters OU-cycle line current to a frequency of 90 (twice that of shutter) for supplynig the arc. I'he trim is 7-mm. x 14 suprex positive carbon, unrotated. C. S. Ashcraft Manufacturing Company, 36-38 Steinway & Northern Boulevard, Long Island City, N. Y. LAMPS, D.C. PROJECTION ARC PROJECTION ARCS of high-intensity characteristics for operation on direct current are of two general classes — condenser and reflector types. The high-intensity reflector types in turn are divided into suprex and "one-kilowatt." Condenser type high-intensity projection arc lamps specifically adapted to theatres are those operating at from 120 to 130 amperes and 65 to 70 volts ; others of higher arc wattage are available, however. Suprex arcs adapted to medium-size houses are operated at currents ranging from 35 to 65 amperes, and 31 to 40 volts at the ar,c. Carbon combinations are 6 mm. positive, 5 mm. negative for from 35 to 40 amperes ; 7 mm. positive, 6 mm. negative for from 42 to 50 amperes ; and 8 mm. positive, 6.5 or 7 mm. negative for from 56 to 65 amperes. Designed to replace the low-intensity arc with a high-intensity light source in the smaller theatres, the "one-kilowatt" arc employs a cored negative carbon specifically made to give smooth operation at very low current densities, with operation at 40 amperes, 27-27^ volts, or about o'le kilowatt at the arc. The manufacturers listed below make equipment for the application of any of these arcs. C. S. Ashcraft Manufacturing Company, 36-38 Steinway & Northern Blvd., Long Island City, N. Y. The Ballantyne Company, 1707-11 Davenport Street, Omaha, Nebr. Brenkert Light Projection Company, 6545 St. Antoine Avenue, Detroit, Mich. Forest Manufacturing Corporation, 60 Park Place, Newark, N. J. J. E. McAuley Manufacturing Company, 554 West Adams Street, Chicago, 111. Morelite Co., Inc., 600 West 57th Street, New York City. National Theatre Supply Division of National SimplexBludworth, Inc., 92 Gold Street, New York City. The Strong Electric Corporation, 87 City Park Avenue, Toledo, Ohio. LAMPS, INCANDESCENT FOR PROJECTION INCANDESCENT LAMPS for theatre motion picture projection are characterized by a high degree of source concentration and relatively high wattage. The most effective lamp for this purpose — the 2,100watt, 60-volt T-24 bulb — is designed for lower voltage to secure additional source concentration. Hence a transformer with voltage-regulating characteristics is required. This lamp provides fair illumination for images up to 16 feet wide at throws not to exceed 100 feet. There are also available, 1,000-watt prefocus base, and 1,500-watt bipost base, 100-120 volt, T-20 bulb lamps employing the biplane filament construction. This construction makes possible relatively high source concentration for lamps operating at ordinary circuit voltages and thus saves the cost of auxiliary apparatus. For portable 35-mm. motion picture projectors there are the SOO-watt monoplane-filament, and the 7S0-watt and 1,000-watt biplane filament lamps in T-20 bulbs with medium-prefocus bases. The 7S0-watt and 1,000-watt require forced ventilation. Another type of 1,000-watt projection lamp designed to burn base down gives considerably greater output of light, and does not require the inclusion of anti-blackening electric grids internally. For stereopticon projectors there are a SOOwatt short T-20, medium-prefocus base projection lamp, and a 1,000-watt long T-20 bulb, mogul-prefocus base lamp. Both are of the 100120 volt type and employ monoplane filaments. General Electric Company, Incandescent Lamp Department, Nela Park, Cleveland, Ohio. Radiant Lamp Corporation, 260 Sherman Avenue, Newark, N. J. Westinghouse Electric Corporation, Lamp Division, Bioomfield, N. J. e LAMPS, INCANDESCENT FOR THEATRE LIGHTING GENERAL SERVICE lamps — available in sizes from 15 to 1,500 watts — serve the majority of lighting apphcations in and around theatres. Except for the tubular bulb bipost lamps, all are designed for burning in any position; all are available with inside-frosted finish to diffuse the light, to eliminate filament striations, and to produce a smoother lighting effect. The frosting absorbs little light — in fact, inside-frosted and clear lamps (clear lamps are regularly available in in light outDUt. Inside-colored lamps for sign and decorative service : The general service lamps mentioned above are suitable for enclosed lamp signs and luminous displays where protected from rain and snow. For outdoor exposed applications, a line of vacuum lamps from 6 to 50 watts is available in frosted and inside-colored types. Outside-colored lamps: Several sizes of outside-colored lamps are also listed in round and flame-shaped bulbs. Lumiline lamps: Available in colors and in 30 and 60 watts (length 17^ inches) and 40 watts (length 11% inches), these tubular lamps have, by their physical shape, introduced new concepts of decorative lighting design. They may be used exposed or in narrow reflecting and shielding equipment. The standard colors are white, straw, orange, moonlight blue, emerald and surprise pink. Also on the market is a filament tubular lamp which differs from the "lumiline" in that it plugs in along its length instead of at the ends, thus permitting an interrupted line of light. These lamps are also available in higher wattages — up to 200 watts. Lengths of units are 6, 12, 18 inches, etc., up to 36, and there are three diameters. They may be obtained in sprayed colors, sprayed white and opal glass. Fluorescent lamps: These are much more efficient than the filament-type lumiline lamps, and are particularly recommended for color lighting, since the color is not created by the glass of the bulb, but in the light itself. The lamp is of the electric discharge type, using mercury vapor as the medium for sustaining the arc. Ultraviolet radiation is produced in the tube, which acts upon certain chemicals (the nature of which varies according to the color or tone of white light desired) with which the interior of the bulb has been treated. The reaction of the chemical to the electronic bombardment produces visible light. These lamps differ from the usual type filament lamps in that they contain their own reflecting surface which is hermetically sealed within the lamp providing a high-intensity, accurately controlled beam. Slimline lamps are a later development of fluorescent types, operating on higher voltage. They provide long unit light sources well adapted to coves, and are adapted to shaping for architectural lighting. The Projector spot and flood lamps are provided with lens cover glasses which produce narrow and wide beams respectively. They are made of rugged, heat resisting glass and are suitable for service inside and outdoors. They are equipped with medium screw bases to fit regular sockets, PAR 38 bulbs and are available in the 150-watt size. The Reflector spot and flood lamps also have built-in, mirror-like surfaces ; however, they are made of ordinary glass and must be protected from the weather. Like the projector lamps, the spot type has a narrow light distribution of high intensity and the flood, & wide-beam distribution. They are equipped with medium screw bases to fit regular sockets, R-40 bulbs and are available in 150, 200, and 300-watt sizes. General Electric Company, Incandescent Lamp Department, Nela Park, Cleveland, Ohio. Radiant Lamp Corp., 260 Sherman Avenue, Newark, N. J. 44 BETTER THEATRES, MAY 4, 1946