The audio-visual handbook (1942)

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Sources of Information, Materials and Equipment 223 SOUND EQUIPMENT Acoustical Products A COUSTICAL treatment for the school auditorium and certain classrooms in which sound motion pictures, phonograph records, radio programs, etc., are used is sometimes necessary in order to get the most satisfactory results. Materials most frequently used are sound absorbent tiles, acoustic plaster, rock wool and similar products. Most manufacturers of acoustic materials can supply reliable acoustical recommendations. Armstrong Cork Company, Lancaster, Pa. Atlantic Gypsum Company, Boston, Mass. Atlas Sound Corporation, 1451 39th St., Brooklyn, N. Y. The Celotex Company, 919 North Michigan Ave., Chicago, 111. Garrison Engineering Corporation, 51 Church St., Great Barrington, Mass. General Insulating & Manufacturing Company, Alexandria, Ind. Johns-Manville Corporation, 22 East 40th St., New York City Masonite Corporation, 111 West Washington St., Chicago, 111. National Theatre Supply Company, 92-96 Gold St., New York City United States Gypsum Company, 300 W. Adams St., Chicago, 111. Universal Gypsum & Lime Company, 105 W. Washington St., Chicago, 111. Western Felt Works, 4029-4133 Ogden Ave., Chicago, 111. Wood Conversion Company, First National Bank Bldg., St. Paul, Minn. Microphones There are many uses for microphones in schools: to speak through sound motion-picture amplifiers and speakers; for sound recording; with centralized sound systems, etc. Microphones can be used with separate amplifying and loudspeaker equipment, or can be operated through the existing sound installation. American Microphone Company, Los Angeles, Calif. Astatic Laboratory, Incorporated, Youngstown, Ohio Brush Development Company, Cleveland, Ohio RCA Manufacturing Company, Inc., Educational Department, Camden, N. J. Shure Brothers, Chicago, 111. Western Electric Company, 250 West 57th St., New York City Phonographs The increasing importance of recordings of all types requires equipment designed to meet the needs of classroom and auditorium reproduction. The following organizations produce such equipment: Emerson Radio & Phonograph Corporation, New York City Farnsworth Radio & Television Company, Fort Wayne, Ind. Magnavox Company, Inc., Fort Wayne, Ind. Philco Radio & Television Corporation, Philadelphia, Pa. RCA Manufacturing Company, Inc., Camden, N. J.