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 a low-cost wave analyzer; how to convert an incandescant light bulb to an x-ray tube; how to use an electric toothbrush to generate waves; the use of a light-emitting diode as a point light source; how to rejuvenate helium-neon lasers; and calibration of an ammeter. (MLH)

Includes five brief articles on: solar-heating demonstration equipment, mercury or sodium vapor lamp spectroscopy, an apparatus for simulating variable stars, a voltage-to-frequency converter, and an introductory absorption experiment for low-energy beta particles. (MLH)

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

Describes a method for performing a thermodynamic "ice bomb" demonstration which is faster, simpler, and cheaper than commercially available demonstration devices. (SL)