For individual records:
(1) fatigue-lapses, all for non-visual, are less numerous and of less magnitude than for the hands and head, for the vertical movement of foot is likely to be of less extent than that of head and hands for the particular motion required here;
(2) there is no foot capable of being called more accurate than its mate;
(3) the eyes appear to be of no value for reducing or regulating errors for foot-movements.
For lines 1 cm. long:
Average of six subjects:
It may be said in general that
(1) the visual sense is valueless for promoting accuracy or regularity of curve;
(2) errors of foot-movements are more regular and, for the constant errors, more accurate than for the head-records;
(3) errors of foot-movements are less and less regular by 50% as compared with records for the hands;