A light flasher was developed for use with the open-shutter photography technique in elementary-mechanics experiments. Details are given of its design and construction. Five experiments, for the elementary mechanics laboratory, which use flasher units are described. (DT)

Increasing the flexibility of a well equipped laboratory by eliminating rigid scheduling gives students a choice of experiment and allows them to do experiments in depth. Student motivation, interest, and learning were increased. (DF)

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

Describes a computer-based homework grading system that accepts a constructed response by the student, multiple attempts, generation of new data for each student, records of performance, and provision of some feedback about answers. (Author/CP)