Bauhaus-Universität Weimar

Researches in practice and habit. 
65 
the New Haven city schools, who had previously had considerable 
practice in drawing circles in the school-room ; M. C.., a girl of twelve ; 
B., C., H. and J., students in the university. 
A characteristic expression for the deviation of the drawn curve from 
the true circle may be found by comparing the longest diameter with the 
shortest one. The two diameters were measured in millimeters and theii 
difference was considered as the amount of error. 
It was deemed advisable to limit the number of circles drawn at one 
sitting to ten, so that the element of fatigue might be almost if not com¬ 
pletely eliminated. Preliminary experimentation showed that the influ¬ 
ence of fatigue was not perceptibly present with the right hand until the 
ninth or tenth repetition, and with the left hand until the fifth, to seventh 
repetitions. However, those curves in the series which most nearly ap¬ 
proximated true circles resulted in attempts ranging from the fourth to 
the seventh. Consequently, under ordinary circumstances, the drawing 
of five circles would give sufficient practice for the subject to reach an 
approximate maximum of accuracy of adjustment. Hence it was deemed 
best to stop the experiment at a point where the subject was gaining in 
accuracy rather than to continue it until the errror began to increase. 
Gain on successive days. 
The average errors for each day are shown in Table V. 
Table V. 
Average 
error on 
successive days. 
Hand 
Serial number of experiment. 
Subj ect. 
used. 
i 
2 
3 
4 
5' 
6 
B. 
[R 
12 
9 
12 
11 
8 
9 
\L 
10 
9 
7 
5 
5 
8 
M.C. 
\ï 
10 
13 
9 
10 
7 
7 
7 
6 
6 
S 
.4 
4 
C. 
(R 
6 
6 
S 
4 
4 
3 
U 
10 
9 
9 
9 
8 
7 
J.F. 
JR 
6 
6 
5 
5 
3 
2 
U 
11 
10 
9 
8 
8 
4 
S.F. 
JR 
6 
6 
6 
S 
4 
4 
\L 
7 
6 
S 
5 
4 
4 
H. 
JR 
9 
9 
8 
7 
7 
6 
u 
7 
8 
10 
8 
9 
10 
J- 
JR 
11 
6 
5 
5 
4 
3 
u 
9 
13 
8 
12 
7 
6 
The unit of measurement is Imm. 
Number of experiments each day, 5 with either hand. 
The probable error of a determination varies from ± imm to ± o. imm. 
5
        

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