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142 CLASSIFIED INDEX High-Precision Sound-Film Recording Machine, H. Pfannenstiehl, v. 29, no. 2 (Aug. 1937), p. 202. Light-Weight Stage Pick-up Equipment, L. D. Grignon, v. 29, no. 2 (Aug. 1937), p. 191. Power-Level Indicators for Sound Recording, F. L. Hopper, v. 29, no. 2 (Aug. 1937), p. 184. Transmission-Measuring System Utilizing a Graphic Recording Meter, W. W. Lindsay, Jr., v. 29, no. 1 (July 1937), p. 68. Neon Type Volume Indicator, S. Read, Jr., v. 28, no. 6 (June 1937), p. 633. Microphone Mixers, M. Rettinger, v. 28, no. 6 (June 1937), p. 604. RCA Sound Recording System, M. C. Batsel and E. W. Kellogg, v. 28, no. 5 (May 1937), p. 507. Single-Channel Recording and Re-Recording System, H. I. Reiskind, v. 28, no. 5 (May 1937), p. 498. Recent Developments in Magnetic Sound Recording, S. J. Begun, v. 28, no. 5 (May 1937), p. 464. Direct Recording and Reproducing Materials for Disk Recording, A. C. Keller, v. 28, no. 4 (Apr. 1937), p. 411. Review of the Quest for Constant Speed, E. W. Kellogg, v. 28, no. 4 (Apr. 1937), p. 337; Erratum, v. 28, no. 5 (May 1937), p. 579. New Recording Equipment, D. R. Canady and V. A. Welman, v. 28, no. 3 (Mar. 1937), p. 309. Influence of Sprocket Holes upon the Development of Adjacent Sound-Track Areas, J. G. Erayne and V. Pagliarulo, v. 28, no. 3 (Mar. 1937), p. 235. New High-Quality Portable Film-Recording System, F. L. Hopper, E. C. Manderfeld, and R. R. Scoville, v. 28, no. 2 (Feb. 1937), p. 191. Slide-Rule Sketches of Hollywood, H. G. Tasker, v. 28, no. 2 (Feb. 1937), p. 158. - Record Word-Spotting Mechanism, R. H. Heacock, v. 28, no. 1 (Jan. 1937), p. 63. Recent Improvements in the Variable-Width Recording Sysem, B. Kreuzer, v. 27, no. 5 (Nov. 1936), p. 562. Harmonic Distortion in Variable-Density Records, B. F. Miller, v. 27, no. 3 (Sept. 1936), p. 302. Unidirectional Microphone, H. F. Olson, v. 27, no. 3 (Sept. 1936), p. 284. Acoustic Considerations in the Construction and Use of Sound Stages, D. P. Love, v. 27, no. 3 (Sept. 1936), p. 267. New High-Vacuum Cathode-Ray Tubes for Recording Sound, M. von Ardenne, v. 27, no. 2 (Aug. 1936), p. 195. Contributions of Telephone Research to Sound Pictures, E. C. Wente, v. 27, no. 2 ,(Aug. 1936), p. 188. Improved Resolution in Sound Recording and Printing by the Use of Ultra- violet Light, G. L. Dimmick, v. 27, no. 2 (Aug. 1936), p. 168. Mechanical Reversed-Bias Light-Valve Recording, E. H. Hansen and C. W. Faulkner, v. 26, no. 2 (Feb. 1936), p. 117. New Method of Increasing the Volume Range of Talking Motion Pictures, N. Levinson, v. 26, no. 2 (Feb. 1936), p. 111.