ABSTRACT
THE fatigue hypothesis was studied in relation to two sets of data. The first set was output data arranged to show variations in rate of work for consecutive days of the week, for morning and afternoon, and for a composite working day. The second set of data was composed primarily of organic indices and included such things as blood pressure readings and cardio-vascular skin reaction readings. Unlike the output studies, the latter were made intermittently and covered comparatively short periods of time.
