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A contact lens photoelectric eye movement recording system is described. The transducer is carried on a dental bite and the subject is permitted freedom of movement within the limitations of a trailing HT and signal lead, reasonable ambient illumination is permissible. Sensitivities of the order of 40-sec arc/cm of trace deflection are readily obtainable, with a dynamic range in excess of 56 db. Although primarily designed as a device for measuring the movements of eyes, the technique has been used for other purposes where it is required to measure displacement without loading the moving member.