(1) left-hand records are less accurate and regular than the right-hand curves;
(2) visual control reduces error and irregularity in all cases, but is more marked with the left hand;
(3) errors increase with speed-increase;
(4) compound-motion records show little increase in error or irregularity, as compared with the simple motions.
For constant errors:
No marked peculiarities are to be noted, but in general,
(1) left-hand records are less accurate and regular;
(2) visual control reduces errors and irregularity;
(3) errors reduce with increase of speed, except for compound motion uncontrolled visually;
(4) compound-motion errors are not much greater, nor is the irregularity increased.