PERISCOPE SYSTEMS FOR RECORDING THE UNDERWATER MOTIONS OF A SWIMMER

This technical note describes a number of half-periscope devices designed to permit distortion-free records of the underwater motions of a swimmer to be obtained conveniently, at low cost, and without risking damage to the recording equipment. The basic design consists of a camera and camera support system, a mirror and mirror support system, and a wave deflector. Several variations of this half-periscope design and setup are described. The main advantages of the use of such periscope systems are their light construction and the consequent ease with which they can be transported and set up, their versatility with respect to the positions at which they can be placed around a pool, and the flexibility provided by variations in design and setup.