The purpose of this study was to develop a model to describe the response of a subject feeding items into a machine. Analysis of a set of data produced a first order servo system with a corner frequency of about 110 cycles per minute. At low frequencies the gain of the system approached one and at high frequencies it decreased at a rate which approached —6db per octave. An additional analysis based on the distribution of the time periods required to handle the items gave a response curve very closely fitting the first order servo system and the experimental data.
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