It should be kept in mind that the compound records were in all cases taken in connection with a duplicate series of lines for one hand, and called simple movements. These simple movements correspond with the free-movement records that have been considered already.
The purpose has been to bring out the modification of results that a compound movement introduces, rather than to bear heavily on intrinsic phenomena, i. e., comparison is deemed more important.
For lines 10 cm. long:
Average of seven subjects:
We find for mean and constant errors:
(1) left-hand records are less accurate and uniform;
(2) visual control increases accuracy and regularity, especially for the left hand;
(3) there is an increase as the speed increases for mean errors, and a decrease for constant errors;
(4) compound movements are practically as accurate and regular as the simple ones for constant errors.
For individual cases: