Seven experiments and 40 activities are presented in this handbook. The experiments are related to Young's experiment, electric forces, forces on currents, electron-beam tubes, and wave modulation and communication. The activities are primarily concerned with aspects of scattered and polarized light, colors, image formation, lenses, cameras, refraction, gratings, speed of light, electric fields, batteries, magnets, perpetual motion machines, electron tubes, Faraday disc dynamo, generators, motors, and Bell telephone science kits. Demonstrations, construction projects, and self-directed instructions are stressed in these activities. The four chapters in the handbook are designed to correspond to the text materials, with complete instructions in each experiment. Some experiments are suggested for assignment, and the remaining are used at student discretion. Illustrations and film loop notes for explanation use are included. The work of Harvard Project Physics has been financially supported by: the Carnegie Corporation of New York, the Ford Foundation, the National Science Foundation, the Alfred P. Sloan Foundation, the United States Office of Education, and Harvard University. (CC)