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CLASSIFIED INDEX 107 Quarter-Wave Method of Speaker Testing, S. L. Reiches, v. 38, no. 5 (May 1942), p. 457. Multiple-Speaker Reproducing Systems for Motion Pictures, H. I. Reiskind, v. 37, no. 2 (Aug. 1941), p. 154. Horn Consisting of Manifold Exponential Sections, H. F. Olson, v. 30, no. 5 (May 1938), p. 511. Modern Theater Loud Speakers and Their Development, C. Flannagan, R. Wolf, and W. C. Jones, v. 28, no. 3 (Mar. 1937), p. 246. Dividing Networks for Loud Speaker Systems, J. K. Milliard and H. R. Kim- ball, v. 27, no. 1 (July 1936), p. 61. Study of Theater Loud Speakers and the Resultant Development of the Shearer Two-Way Horn System, J. K. Hilliard, v. 27, no. 1 (July 1936), p. 45. Wide-Range Reproduction in Theaters, J. P. Maxfield and C. Flannagan, v. 26, no. 1 (Jan. 1936), p. 67. MICROCINEMATOGRAPHY (See also Cinematography; and Photography) New Uses of Sound Motion Pictures in Medical Instruction, H. Roger, v. 32, no.5 (May 1939), p. 527. MICROFILM (See also Micro photography) Maps on Milcrofilm—Some Factors Affecting Resolution, M. Bruno, v. 41, no. 5 (Nov. 1943), p. 412. Microfilm Copying of Documents, T. R. Schellenberg, v. 27, no. 1 (July 1936), p. 90. Some Technical Aspects of Microphotography, R. H. Draeger, v. 27, no. 1 (July 1936), p. 84. Activities of Science Service in Scientific Documentation, W. Davis, v. 27, no. 1 (July 1936), p. 77. MICROPHONES (See also Sound Recording) Small Microphone Boom, B. F. Ryan and E. H. Smith, v. 45, no. 6 (Dec. 1945), p. 441. Anecdotal History of Sound Recording Technique, W. A. Mueller and M. Ret- tinger, v. 45, no. 1 (July 1945), p. 48. General and Design Considerations of Low-Noise Microphones, A. L. Williams and H. G. Baerwald, v. 36, no. 6 (June 1941), p. 649. Determination of Microphone Performance, F. L. Hopper and F. F. Romanow, v. 36, no. 4 (Apr. 1941), p. 341. Line Type of Microphone for Speech Pick-up, L. J. Anderson, v. 36, no. 3 (Mar. 1941), p. 309. Line Microphones, H. F. Olson, v. 36, no. 3 (Mar. 1941), p. 302. Characteristics of Modern Microphones for Sound Recording, F. L. Hopper, v. 33, no. 3 (Sept. 1939), p. 278. Cardioid Directional Microphone, R. N. Marshall and W. R. Harry, v. 33, no. 3 (Sept. 1939), p. 254. Unidirectional Microphone Technic, J. P. Livadary and M. Rettinger, v. 32, no. 4 (Apr. 1939), p. 381.