Presents two demonstrations: heatwave focusing by concave reflectors and wave speed on a string. Describes the apparatus, and procedures for the demonstrations. (YP)

Instructions for the construction of this instrument and its use are presented. The use of common materials is emphasized. (CW)

Describes apparatus for Doppler demonstrations. Provides several pictures of the apparatus and ways it could be used. (YP)

Describes three demonstrations: (1) "A 'Rocket' Cart" (using a fire extinguisher and a child's truck); (2) "Angular Momentum Conservation" (providing materials and calculations); and (3) "Cavendish Experiment" (including the building method and examples of calculations). (YP)

Described is a spectroscope which can be easily constructed from a film canister. Instructions for building this equipment are provided. (CW)

Describes making laboratory apparatus such as a heavy-duty turntable; a hand-held milk-carton accelerometer; an inverted air table; free-fall measurement with a solenoid as a starting device; and a bright point source. Presents an evaluation of "The Champ Universal Interface and Sensor Pack Software." (YP)