Bauhaus-Universität Weimar

Researches on acoustic space. 
2 5 
Thus in Johnson’s case the greatest distance was 60 inches (150""), 
while in the case of Wakamatsu it was about 12 inches (30'“) ; the 
shortest distance was 6 inches (150'") in the case of the former and 3.7 
inches (9"") in the case of the latter. 
In the preceding experiments the intensity of the sound was not 
changed in regular succession, for it was desirable to eliminate the in¬ 
fluence of suggestion from the results. It seemed, however, desirable to 
repeat the experiments by changing the intensity of sound, both de¬ 
scending and ascending in regular order. The average results of the ex¬ 
periments conducted in this way are given in Table X. Here the 
changes in the direction and the distance were perceived with greater 
regularity, but in other respects the results were not greatly different from 
those of the preceding experiments. 
Figures 7 and 8 show the results diagrammatically. 
In closing the experiments of the first group I tried to see whether a 
curve of the localized points for the perceived sounds could be ob¬ 
tained if the two sounds were given continuously for a certain length of 
time during which the intensity of one of the two component sounds was 
varied in diminuendo or in crescendo. The experiments were made on 
the observer C. W. 
a. When the intensity of the left sound was changed in diminuendo, 
by sliding the secondary coil from Tra to 15'“, while keeping the inten¬ 
sity of the right sound constant, the sound was perceived as if travelling 
Taülk X. 
Case I. 
1 )istance of the 
secondary coil 
Judgment of 
Judgment of 
Number of 
for the left 
direction. 
distance. 
experiments. 
telephone. 
I3cm 
90° 
8.75,m (26e"1) 
3 
12 
fr 76.7 
9 (27) 
3 
11 
fr 76.7 
9 (27) 
3 
10 
/>■ 73-3 
9-3 (28) 
3 
9 
fr 61.7 
10 (30) 
3 
8 
Jr 33-3 
10 (30) 
3 
7 
fr 13-3 
9-3 (28) 
3 
6 
/ or b\ß 15 
8; 9 (24; 27) 
3 
5 
Jt 26.7 
8 (24) 
3 
4 
Jl 40 
6.7 (20) 
3 
3 
ß 43-3 
5-7 (17) 
3 
2 
ß 7° 
4-5 (13) 
3 
i 
fl 7° 
4-3 (13) 
3 
In Case I the probable error for direction varies from oto ± 25% and that for the dis¬ 
tance from o to ± 5%.
        

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