Describes apparatus for demonstrating wave motion in a ripple tank, the conservation of momentum on a linear air track, and velocity distribution in an ideal gas simulator. (SL)

Includes description of a light meter, photometer, fluid flow apparatus, and acoustic grating. (RH)

Presents information on a centrifugal force apparatus, signal averaging with a minicomputer, and the use of an air track. (MLH)

Presents four notes that report new equipment and techniques of interest to physics teachers. These notes deal with collosions of atoms in solids, determining the viscosity of a liquid, measuring the speed of sound and demonstrating Doppler effect. (HM)

Describes (1) a rippler assembly which makes use of a loud speaker and a stroboscopic light source designed for this application; and (2) an experiment using a force table that has been modified for a capstan experiment. (JN)

Describes an intelligent lightbulb, an optelectric feedback circuit which bridges the conceptual gap between manual and all-electric servos. The circuit is simple and easily understood in dc terms. Also describes a device for demonstrating wave motion constructed with plastic soda straws. (Author/SK)

Two equipment systems are described: mechanical start-stop gates for air tracks, and a large-scale magnetic induction demonstration. (CS)

Presents seven notes on new equipment, techniques, or materials of interest to teachers of physics. A circuit of a low-cost computer terminal to audiovisual device interface, and a demonstration of the buoyancy of air are among notes presented. (HM)

Reports new equipment, techniques, or materials of interest to teachers of physics. (Editor/CP)

Articles describing construction of an inexpensive spectrograph, improving focusing of Polaroid cameras, use of space satellites for instruction, and construction of an optics demonstration platform. (RH)

Describes a simple digital waveform synthesizer, a chronograph for measuring projectile velocities, and a versatile beam splitter for holographers. (MLH)

Describes the following: a low-pressure sodium light source; a design of hot cathodes for plasma and electron physics experiments; a demonstration cart for a physics of sound course; Bernoulli force using coffee cups; a spark recording for the linear air track; and a demonstration of the effect of altering the cavity resonance of a violin. (GA)

Describes three pieces of scientific apparatus and their demonstrational use: a high temperature apparatus for positron annihilation studies, a digitally synthesized classroom variable star, and a demonstration of plasma laser-beam focusing using paint stripper flames. (GA)