IOWA ACADEMY OF SCIENCE 
149 
TABLE I. 
Forty per cent Platinum— Iridum Wire. 
Moment of Inertia: 372.4. 
Amplitudes, 1st, 5th, 9th, etc. 
j A A 
A^ 
Double 
Period 
48.7 
2372 
42.5 
6.2 
1800 
0.0133 
14.700 sec. 
87.9 
4.0 
1439 
0.0121 
14.620 
34.0 
3.9 
1150 
0.0114 
14.565 
30.7 
3.3 ‘ 
942 
0.0105 
14,545 
28.0 
2.7 
784 
0.0099 
14.525 
25.6 
2.4 
655 
0.0092 
14.508 
23.65 
1.95 
559 
0.0084 
14,497 
21.95 
1.7 
482 
0.0079 
14.485 
20.45 
1.5 
418 
0.0070 
14.475 
19.10 
1.35 
365 
0.0072 
14.465 
17.85 
1.25 
319 
0.0068 
14.455 
16.88 
1.02 
283 
0.0065 
14.446 
15.88 
0.95 
252 
0.0062 
14.439 
15.02 
0.86 
220 
0.00‘59 
14.432 
14.22 
0.80 
202 
0.0056 
14.426 
13.55 
0.67 
184 
0.0053 
14.420 
12.93 
0.62 
167 
0.0053 
14.415 
12.30 
0.63 
151 
0.0051 
14.412 
11.76 
0.54 
138 
0.0048 
14.408 
11.27 
0.49 
127 
0.0045 
14.405 
10.82 
0.45 
117 
0.0045 
14.402 
10.38 
0.44 
108 
0.0043 
14.399 
10.00 
0.38 
lOO 
0.0041 
14.396 
9.62 
0.38 
93 
0.0042 
14.393 
9.26 
0.36 
86 
0.0041 
14.390 
8.22 
0.34 
80 
0.0039 
14.388 
8.6S 
0.30 
74 
0.0038 
14.386 
8.33 
0.29 
69 
0.0035 
14,384 
8.09 
0.24 
65 
0.0084 
14.383 
7.82 
0.27 
61 
0.0035 
14.381 
7.58 
0.24 
57 
0.0034 
14.380 
7.34 
0.24 
54 
0.0035 
14.378 
7.11 
0.23 
51 
0.0034 
14.377 
6.90 
0.21 
48 
0.0032 
14.370 
6.70 
0.20 
45 
0.0032 
14.375 
6.50 
0.20 
42 
0.0032 
14.373 
6.32 
0.18 
40 
0.0029 
14.372 
6.16 
0.16 
38 
0.0029 
14.370 
5.99 
0.17 
30 
0.0029 
14.368 
5.84 
0.15 
34 
0.0030 
14.360 
5.67 
0.17 
32 
0.0028 
14.364 
5.54 
0.13 
31 
0.0028 
14.363 
5.40 
0.14 
29 
0.0026 
14.361 
5.26 
0.14 
28 
0.0028 
14,359 
5.13 
0.13 
26 
0.0028 
14.358 
