RELATIVELY little is known about diurnal rhythms in chickens, probably because the measurement of activity is not only difficult to record by observation but also very time consuming. The object of this experiment was to test automatic equipment for the measurement of certain types of activity and to obtain data that may be associated with daily variations in these activities. It was assumed that the method might be extended to various other kinds of experiments, if the procedure proved to be satisfactory. METHODS AND MATERIALS Photoelectric systems2 were used to measure the activities under investigation. These units directed a beam of light to a mirror that reflected the beam back to a lens that focused on the photoelectric cell within the unit. Any object passing through the beam would activate an amplifier and relay which, in turn, actuated a counter.3 These counters were tested by the manufacturer at 600 counts …
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Siegel et al. (1956) studied this question.