Showmen's Trade Review (Jan-Mar 1947)

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SHOWMEN'S TRADE REVIEW. January 4, 1947 ing with four inches of mineral wool. Furthermore, the theatre management reported that it was not until after insulating that temperature in the patron's zone could be brought above 56 degrees with existing heating facilities, but that afterward 70 degrees could easily be maintained with a pound and a half of steam pressure, even when outside temperatures dropped to 20 degrees below. As for summer savings, the Town Theatre in Omaha, Neb., in which a fourinch thickness of mineral wool insulation was applied above the ceiling, reported that the first summer after insulating, 20 tons less refrigeration were required, which more than paid for the insulation. Similarly, the Savoy Theatre of Bloomfield, New Jersey, found that after insulating the air compressor operated only intermittently, instead of continuously as before, and that the resulting saving in electrical costs plus fuel savings during the heating season paid for the insulation in two years. Mineral Wool One of the most widely-used materials for effectively insulating buildings of all types is mineral wool, according to the United States Bureau of Mines, which is urging insulation of all human-occupied structures as a fuel conservation measure. It is most effective when installed "full-thick"— about four inches thick — the Bureau has found. Mineral wool is a generic term for a light-weight, fluffy, wool like substance made from rock, ore-smelting slag, or sand. It cannot burn and all three types have virtually the same properties and insulating value. The material is manufactured in batts or blankets and in loose or granular form. The type most generally used in existing buildings is the loose product which is blown under air pressure into the area to be insulated without disruption of normal routine of creating any muss or dirt. The batt or blanket type is installed during the course of construction of new buildings or where the area to be insulated will permit a workman to operate normally. Mineral wool is also recognized by building codes and by engineers as an effective fire-stop. Numerous cases are on record where fires originating on a roof have been slowed appreciably or stopped altogether after reaching the mineral wool blanket above the ceiling. National Bureau of Standards tests show that a woodlath partition filled with mineral wool will stop passage of fire for one hour. (#14). STACEY REJOINS CARRIER Captain Alfred F. Stacey, Jr., air conditioning pioneer and leader in his profession, has rejoined Carrier Corporation after six years of wartime service with the Navy. He will be associated with the sales division. Captain Stacey is the holder of thirtyfive patents on air conditioning equipment and methods, and of the F. Paul Anderfon gold medal, highest award of the Society of Heating and Refrigerating Engineers. He is the designer of many outstanding air conditioning installations, including that in the Capitol of the United States at Washington. (#15). ■-■23 Series 11 Speeds up to f/2.0 in focal lengths up through 5". Coated lenses. Hermetically sealed mounts. Series 1 Speedsupto f/2.3 in the shorter focal lengths. Features come and features go— some with stars, some with unknowns. But with SNAPLITE lenses in your projectors you are assured a star performance every time. Gone are dim images . . . fuzzy outlines . . . annoying color fringes. Instead— brilliant images . . . crisp outlines . . . sharp contrast! There are SNAPLITE lenses for every projection need— all produced to the same exacting standards of quality and precision. 2 Franklin Avenue / f / Brooklyn 11, New York (^^^W COItl'OltilTION MWTHEAlRt IQUIPM6HT! NS-40 35 M/M REWINDER ■m The AU-"N"-One Job, adaptable for motor drive. "Snap-On" handle converts to hand rewind. NS-1 HAND REWINDER Deluxe bench type, fully enclosed hand rewinder. Xt Write for Catalog . Mention Your Dealer WENZEL PROJECTOR COMPANY 2505-19 So. State Street Chicago 18, 111.