192 
IOWA ACADEMY OF SCIENCE 
Another set of experiments similar to that mentioned in the preced- 
ing section was tried, the difference between the two being that in 
this case the wire was started at the large amplitude at first, and then 
successively started at the lower amplitudes. It was thought that this 
would settle the question as to whether the period depends merely 
upon the amplitude, or whether, in a more complicated fashion, it de- 
pends to a large extent upon the preceding history of the wire. The 
latter was found to be true, and the results for the amplitude-period 
.relations are showu in table 5 (a) -Fig. 4, and for the amplitude-loga- 
TABLE 5- (a). 
Length, 40.2 cms. Moment of inertia, 980 g. cm^ 
No. 
1 
Amp. 
Period 
No. 
Amp. 
Period 
No. 
I 
1 
! 
Amp. 
Period 
0 
477 
5.958 
’ 0 
151 
5.905 
0 
108 
5.825 
2 
437 
.958 
4 
117 
.860 
4 
81 
.810 
4 
398 
.958 
10 
74 
.773 
10 
48.3 
.690 
6 
361 
.957 
16 
43 
.660 
14 
33.3 
.604 
8 
326 
.953 
20 
30 
.580 
16 
27.9 
.562 
15 
219 
.925 
.24 
21 
.485 
20 
19.9 
.485 
24 
113 . 
.820 
28 
16.2 
.415 
26 
13.3 
.387 
30 
64 
.678 
35 
11.4 
.345 
30 
10.9 
.350 
34 
43 
.595 
45 
8.1 
.297 
36 
8.7 
.314 
40 
26 
.475 
55 
6.4 
.267 
40 
. 7-. 8 
.297 
55 
13 
. .330 
65 
5.4 
.253 
50 
6.1 
.263 
65 
10 
.290 
75 
5.0 
.247 
55 
5.5 
.253 
80 
7 
.255 
85 
4.4 
.244 
60 
5.1 
.245 
85 
6.7 
.248' 
95 
4.0 
.240 
80 
4.2 
.240 
100 
5.7 
.236 
100 . 
3.8 
.239 
100 
3.4 
.236 
101 
5.55 
.236 
121 
3.23 
.231 
136 
2.52 
.231 
179 
3.06 
.231 
174 
2.47 
.225. 
190 
2.01 
.222 
237 
2.39 
.227 
232 
2.02 
.224 
244 
1.67 
.222 
301 
1.92 
.219 
299 
1.64 
.222 
303 
1.41 
.222, 
370 
1.57 
.216 
371 
1.38 
.222 
362 
1.22 
.222 
