Describes: (1) a seven-segment LED display successfully used as an "illuminated" object for introductory optics experiments and advantages for its use; (2) a series/parallel circuit demonstration especially useful in introductory courses for nonmajors; and (3) a method for igniting a sodium arc lamp with an incandescent lamp. (JN)

Describes a demonstration to initiate discussion about electrostatic effects. Also describes and evaluates a Magnetic Bubble Apparatus, a device which exhibits several phenomena related to magnetic domain formation. Includes manufacturer's response to the evaluation. (JN)

Describes an apparatus for plotting electric fields using burglar alarm window tape for electrodes and carbonized electronic stencil paper as sheet resistance. Also describes a simple pentode modulator circuit which will modulate a typical helium-neon gas laser, providing an audio channel for demonstration purposes. (SK)

Descriptions of equipment and procedures are provided for: (1) a detection system for mass-spring oscillations; (2) an economical holography table; (3) demonstration alternating-current circuit board; and (4) demonstration of damped oscillation using a set of magnets. (SK)

Describes: (1) a variable inductor suitable for an inductance-capacitance bridge consisting of a fixed cylindrical solenoid and a moveable solenoid; (2) long-range apparatus for demonstrating falling bodies; and (3) an apparatus using two lasers to demonstrate ray optics. (SK)

Describes a versatile mount for Slinky wave demonstrator and dynamics experiments using pool balls which have been altered by various means such as hollowing out or filled with lead. Suggests tightening screw holding motor clamp to prevent random speed fluctuations in ripple tanks. (JN)

Discusses: (1) construction of an integrated spherical reflectometer; (2) limitations of the NOAA Weather Radio Network; and (3) a simple experiment to demonstrate/measure influence of damping force on amplitude resonance. Also discusses whether or not a homemade electrophorus can lose its charge and then recharge itself. (JN)

Describes a set of equipment which can be mounted on magnetic chalkboards or other ferromagnetic surfaces, useful for both experiments and demonstrations in mechanics, including center of mass experiments, and force vector experiments using string, spring scales, weights, and pulleys. (SK)