Squires' concept provided a substantial increase over Farley's concept in the one-handed, two-handed and total normal working areas and in the normal front range for all types of operators and resulted in a relatively small decrease in the normal side range in all but one instance. The minimum and maximum increases in the total normal working area were 398 and 1194#x2009;cm2, respectively, and the corresponding percentage increases were 24 and 43, respectively. Considering the overall increase in the normal working area and the dynamic nature of the movement of the arm while the hand sweeps an arc in the normal horizontal working area, Squires' concept is recommended in preference to Farley's concept.
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