Motion Picture Herald (Sep-Oct 1936)

THE EQUIPMENT INDEX A CATALOG OF THEATRE EQUIPMENT, FURNISHINGS, OPERATING SUPPLIES AND ARCHITECTURAL MATERIALS, LISTING THEIR MANUFACTURERS. THE ARRANGEMENT IS ALP HADETICAL ACCORDING TO THE CLASS OF PRODUCT ACCOUNTING SYSTEMS simplified bookkeeping is provided by special theatre systems designed to cover daily expenses, daily cash receipts, assets, yearly income tax forms, segregated accounts for film exchanges, etc. These systems cover periods of from one to two years, and are available in solid book or looseleaf form. ACOUSTICAL PRODUCTS AND ENGINEERING acoustical treatment for the motion picture theatre auditorium has become more needful of careful attention than it originally was, because of extension of the frequency range. Motion picture speech and music can now be recorded and reproduced wth great fidelity, but the transmission process includes acoustics as well as electro-mechanical provisions; hence, natural sound now calls for greater precision in acoustical adjustments with respect to the entire available frequency band. Acoustic materials are available not only to suit every acoustic defect, but to fit into most any decorative scheme, and to meet requirements as to labor costs under varying circumstances. Materials most frequently used are sound absorbent tiles, acoustic plaster, rock wool and similar products. Which to use partly depends on the natural acoustic characteristics of the auditorium and the decorative scheme desired. Most manufacturers of acoustic materials can supply a reliable acoustical analysis of an auditorium. Armstrong Cork Co., Lancaster, Pa. Atlantic Gypsum Company, Boston, Mass. Atlas Sound Corp., 1451 39th St., Brooklyn, N. Y. Better Hearing, Inc., 1 West 34th Street, New York City. The Brush Development Co., E. 40th Street and Perkins Avenue, Cleveland, O. The Celotex Company, 919 N. Michigan Avenue, Chicago, 111. J. R. Clancy, Inc., 1010 W. Belden Avenue, Syracuse, N. Y. Colortone, Inc., Sturgis, Mich. Electrical Research Products, 250 West 57th Street, New York City. Garrison Engineering Corp., 51 Church Street, Great Barrington, Mass. General Insulating & Manufacturing Company, Alexandria, Tnd. Good-All Electric Mfg. Co., 251 Spruce Street, Ogallala, Nebr. The Insulite Company, 1212 Builders Exchange, Minneapolis, Minn. Johns-Manville Corporation. 22 East 40th Street, New York City. _ Lipman Engineering Co., 415 Van Braam Street, Pittsburgh, Pa. Masonite Corp., Ill West Washington Street, Chicago, 111. Mears Radio Hearing Device Corp., 1 West 34th Street, New York Citv. Miles Reproducer Co., Inc., 112 West 14th Street, New York City. National Rug Mills, Inc., 2494 S. Fifth Street, Milwaukee, Wis. National Theatre Supply Company, 92-96 Gold Street, New York, N. Y. Pictur-Fone Co., 212 W. North, Lima, O. J. H. Stone, 270 Madison Ave., New York City. S.O.S. Corp., 1600 Broadway, New York, N. Y. Transformer Corporation of America, 69 Wooster Street, New York, N. Y. Union Fibre Sales, Inc., Winona, Minn. United States Gypsum Company, 300 W. Adams Street, Chicago, 111. Universal Gypsum & Lime Company, 105 W. Washington Street, Chicago, 111. Western Felt Works, 4029-4133 O'gden Avenue, Chicago, 111. Wood Conversion Company, First National Bank Bldg., St. Paul, Minnesota. ADAPTERS FOR INCANDESCENT PROJECTION LAMPS any carbon arc projector can be converted to mazda operation by means of adapters consisting essentially of a bracket, an adjustable arm, and a reflector to be located behind the lamp. The device is clamped to the lower carbon jaw. Best Devices Company, Film Building, Cleveland, O. Fish-Schurman Corp., 230 E. 45th Street, New York, N. Y. General Electric Co., Schenectady, N. Y. Good-All Electric Manufacturing Company, 251 Spruce Street, Ogallala, Nebr. J. H. Hallberg, 303 Fourth Avenue, New York City. Monarch Theatre Supply Company, 494 So. Second Street, Memphis, Tenn. National Theatre Supply Company, 92-96 Gold Street, New York, N. Y. • AIR CONDITIONING AND VENTILATING EQUIPMENT for human comfort, air conditioning requires not only the heating and cooling of air in accordance with seasonal conditions, but adjustment of relative humidity, removal of dirt and pollen, and suitable removal of old air from the theatre and its replacement with a new supply, together with proper ducts, dampers, fans, etc., for complete distribution of conditioned air. Ventilation, as commonly referred to in the theatre, involves merely the supplying of fresh air. A ventilating system may therefore consist only in provisions for Index to Advertisers appears on page 4 drawing fresh air into the building and giving it, by means of blower fans and ducts leading to openings (grilles) on the interior, suitable circulation. To such a system may be added a dehumidifier or cooling apparatus (such as a cold-water spray chamber). In no case does a ventilation system mean air-conditioning, which term must refer to all the provisions indicated in the first paragraph above, and normally implies automatic control. Cooling of air may be achieved in several ways. There are a few theatres in which a slight cooling effect has been attained by fans capable of introducing fresh air (with proper distribution arrangements) under extremely high pressure. Any kind of controlled cooling, however, demands means of placing the air in contact, directly or indirectly, with a cooling agent, which may be either a chemical refrigerant or water. Mechanical refrigeration is frequently necessary for cooling even when water is the immediate cooling agent. Where well water is available at a temperature of about 55°, this water may be used without mechanical refrigeration. How mechanical refrigeration may be applied depends upon local and State regulations. Air Filters, consisting in a dust-collecting material of cotton or other type of fabric or mesh on rollers or fixed in a metal frame, are designed to filter dirt out of the air introduced into the theatre through the ventilating system. They are not only advised for the complete air-conditioning system, but are effective in connection with a simple ventilating system. Dirty air represents a maintenance problem. Air filters, properly installed, minimize this problem. Ventilating grilles, which are located at the wall openings of air ducts through which the air is introduced into or removed from the interior of the theatre are to varying degrees ornamental and thus prevent these openings from being unsightly. This was once the principal function of grilles, but today a scientifically designed grille gives direction to the air flow, diffuses the air stream and regulates the quantity of air passing through. Grille design has been found an important factor in minimizing or amplifying the mechanical noise of the system. Thus selection of ventilating grilles has an important bearing upon the efficiency of the air-conditioning or ventilating system. Air Controls Inc., Div. of Cleveland Heater Company, 1933 West 114th Street, Cleveland, O. Air Devices Corp., 105 West Adams St., Chicago, 111. Airtemp Inc., 1119 Leo St., Dayton, O. October 17, 1936 45