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SOUND REPRODUCTION, cont'd A New Method of Counteracting Noise in Sound Film Reproduction, W. K. Westmijze, 47: 426-440, Nov. 1946. Psychological and Technical Considera- tions Employed in the Bucky Sound Reproduction and Public Address Sys- tems, Peter A. Bucky, 46: 75-79, Jan. 1946. An Analysis of the Comparison of Beam Power and Triode Tubes Used in Power Amplifiers for Driving Loud- speakers, John K. Milliard, 46: 30-36, Jan. 1946. Loudspeakers Physical Measurements of Loudspeaker Performance, P. S. Veneklasen, 52: 641-656, June 1949. Theater Loudspeaker Design, Perform- ance, and Measurement, J. K. Milliard, 52: 629-640, June 1949. Silent Playback and Public-Address Sys- tem, B. H. Denney and R. J. Carr, 52: 313-319, Mar. 1949. New Theater Loudspeaker System, H. F. Hopkins and C. R. Keith, 51: 385- 398, Oct. 1948. A Proposed Loudness Efficiency Rating for Loudspeakers and the Determina- tion of System Power Requirements for Enclosures, H. F. Hopkins and N. R. Stryker (Summary from Proc. I.R.E., p. 314, Mar. 1948), 50: 615- 616, June 1948. Portable and Semiportable Loudspeaker Systems for Reproducing 16-Mm Sound on Film, John K. HiUiard, 49: 431-438, Nov. 1947. Wide-Range Loudspeaker Developments, H. F. Olson and J. Preston, 47: 327- 352, Oct. 1946. New Permanent Magnet Public Address Loudspeaker, James B. Lansing, 46: 212-219, Mar. 1946. Wave Propagation and Outdoor Field Tests of a Loudspeaker System, F. L. Hopper and R. C. Moody, 46: 115- 123, Feb. 1946. Theater Proposed American Standard Sound Transmission of Theater Projection Screens, Z22.82, 55: 120, July 1950. Theater Reproducer for Double-Width Push-Pull Operation, G. R. Crane, 52: 657-661, June 1949. Versatile Measuring Instrument for Thea- ter Sound Service, C. S. Perkins and E. S. Seeley, 50: 554-562, June 1948. A Modern Sound-Reinforcement System for Theaters, C. E. Talley and R. W. Kautzky, 50: 149-161, Feb. 1948. The Contribution of Theater Service to Twenty Years of Motion Picture Sound Progress, E. S. Seeley, 48: 423-436, May 1947. Postwar Test Equipment for Theater Servicing, Edward Stanko and Paul V. Smith, 47: 457-463, Dec. 1946. Behavior of a New Blue-Sensitive Photo- tube in Theater Sound Equipment, J. D. Phyfe, 46: 405-408, May 1946. Westrex Master Sound Film Reproducer, G. S. Appelgate and J. C. Davidson, 46: 278-283, Apr. 1946. Westrex Standard Sound Film Repro- ducer, G. S. Appelgate and J. C. David- son, 46: 272-277, Apr. 1946. SPECIAL EFFECTS (see also PROJECTION— Background). A Motion Repeating System for Special Effect Photography, O. L. Dupy, 54: 290-294, Mar. 1950. Sensitometric Aspects of Background Process Photography, Herbert Meyer, 54: 275-289, Mar. 1950. The Mult-Efex Titler Device, James T. Strohm, 49: 544-546, Dec. 1947. The Simulation of Radar Presentations for Briefing Purposes, Joseph West- heimer, 48: 586-590, June 1947. Splicing: see LABORATORY PRACTICE Electronic Fire and Gas Light Effect, Harold Nye, 48: 353-360, Apr. 1947. Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement, Frank G. Back, 47: 464-468, Dec. 1946. Naval Training-Type Epidiascope for Universal Projection of Solid Objects, Jacques Bolsey, 47: 418-425, Nov. 1946. 46