150 
IOWA ACADEMY OP SCIENCE 
TABLE II. 
Forty per cent Platinum— Iridium Wire, 
Moment of Inertia: 987.7. 
Amplitudes, 1st, Sth, 9th, etc. 
A A 
A^ 
Double 
Period 
35.4 
31.8 
3.6 
1250 
1011 
0.0104 
24.120 
28.9 
2.9 
835 
0.0097 
24.060 
26.6 
2.3 
708 
0.0091 
24.020 
24.45 
2.15 
598 
0.00861 
23.980 
22.7 
1.75 
493 
0.0080 
23.965 
21.1 
1.6 
445 
0.0077 
28.940 
19.7 
1.4 
388 
0.0074 
28.925 
18.4 
1.3 
339 
0.0070 
23.910 
17.35 
1.05 
301 
0.0066 
23,898 
16.3 
1.05 
260 
0.0063 
23.880 
15.45 
0.85 
239 
0.0068 
28.874 
14.65 
0.801 
215 
0.0056 
23.868 
13.94 
0.71 
194 
0.0054 
23.856 
13.27 
0.67 
170 
0.0053 
28.848 
12.65 
0.62 
160 
0.0050 
23.840 
12.10 
0.55 
146 
0.0018 
23,882 
11.58 
0.52 
134 
0.0040 
28.826 
11.12 
0.46 
124 
0.0045 
28.818 
10.67 
0.45 
114 
0.0043 
23.812 
10.27 
0.40 
115 
0.0042 
28.806 
9.88 
0.39 
98 
0.0042 
23.800 
9.49 
0.39 
90 
0.0040 
23.796 
9.17 
0.32 
84 
0.0038 
23.793 
8.86 
0.31 
78 
0.0037 
23.790 
8.56 
0.30 
73 
0.0036 
23.787 
8.29 
0.27 
69 
0.0083 
23.784 
8.04 
0.25 
- 65 
0.0033 
23.782 
7.8 
0.24 
61 
0 . 0083 ' 
23.780 
