(1) the visual factor is of some value, but the testimony is varied; right hand for increased regularity only, and left hand for greater accuracy only;
(2) curves are horizontal or reducing with speed-increase.
Constant errors,
(1) the more dexterous hand coördinates better;
(2) all errors are positive;
(3) visual control helps only for regularity;
(4) curves are horizontal or rising.
With weight-accelerating movements, the average record shows a sudden rise in mean error at both ends, not in evidence with free or retardation results.
In general it is to be noted:
(1) that the visual element is of no value for reducing the error, and of little value for promoting regularity;