Acoustics. Artificial reverberation, 70(C) Additives. New chemical additive for jet fuel systems, 244(C) Aerodynamics. Prediction of local skinfriction coefficient by transformation of the compressible boundary layer with heat transfer (Chang and Nottage), 445 Aerosols. Apparatus for study of the breakup of liquid drops by high velocity airstreams (Wilcox and June), 169 Aids for blind. Electronic obstacle detector for the blind, 526(C) Aircraft. Ceramic insulation, 246(C) F-100F simulates boost glide vehicle, 522(C) Air pollution. On electrification of carbon black (Beckett and Brasefield), 145(R) Alcorn, Robert L., Jr. Longstreth Medal, 235 Alpha particles. Classroom alpha particle counter, 440(C) • Analysis. The analysis of a vertical and a horizontal cantilever under a uniformly distributed load (Frisch-Fay), 192 Application of graph theory to the analysis of active and mutually coupled networks (Kim), 200 Theory of nonlinear control (Ku), 108 Annual report. President's letter presenting the annual report for 1960, 513 Antarctica. Living insects on high Antarctic plateau, 241 (C) Antennas. Maximum antenna gain of shaped beams (Levine), 184 World's mightiest radio station, 353(C) 528 Apparatus. Membrane permeation cell, 240 (c) Teaching devices demonstrate physics principles, 74(C) Applied mathematics. Elliptic functions in network synthesis (Bedrosian), 12 Applied mechanics. Jump resonance in a third order nonlinear control system (Koepsel), 292 Approximate solution of a class of strongly elliptic linear differential equations (Greenspan), 471 Astronautics. Corrections to "Gravitational torque on a satellite vehicle" (Roberson), 496(R) New environment simulator, 354(C) Satellite determination system, 165 (C) Space environment simulation laboratory, 238(C) Astronomy. Radio telescopes launched into space, 241(C) Stratoscope II, 243(C) Astrophysics. Spiral stellar nebulae and cosmic gas jets (Bruce), 1 Spiral stellar nebulae and cosmic gas jets (Bruce), 419(R) Atomic clock. A new atomic clock, 70(C) New atomic clock, 439(C) Automation. New system for automatic storage and retrieval of information, 521 (C) Remote production control of oil industry, 525(c) Aviation. Aircraft anti-collision system, 520(C) Radar altimeters fooled by polar ice and snow, 525 (C) June, I96I.