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

Described are multichannel analyzers and a high-speed digital counter for a lecture room. (CP)

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 a method for modifying a four-function pocket calculator so that it can be used as a pulse counter. (SL)

This collection of notes describes (1) an optoelectronic apparatus for classroom demonstrations of mechanical laws, (2) a more efficient method for demonstrated nuclear chain reactions using electrically energized "traps" and ping-pong balls, and (3) an inexpensive demonstration for qualitative analysis of temperature-dependent resistance. (CS)

Presents four short articles on: a power supply for the measurement of the charge-to-mass ratio of the electron; a modified centripetal force apparatus; a black box electronic unknown for the scientific instruments laboratory; and a simple scaling model for biological systems. (MLH)

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

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)

Describes an oscillating electroscope, an apparatus to verify the time interval between successive events in nuclear decay, and electronic circuits that are the analog of consecutive reactions. (SL)