IOWA ACADEMY OF SCIENCE 
191 
TABLE 4. 
Mean Amp. 
Log. Dec. 
Mean Amp. 
1 
Log. Dec. 
Mean Amp. 
Log. Dec. 
18.2 
.00072 
46.1 
.00208 
1 
59.3 
.00403 
17.8 
98 
43.8 
218 . 
54.1 
1 393 
17.4 
100 
41.7 
219 
49.4 
i 386 
17.0 
102 
39.7 
208 
45.4 
354 
!().() 1 
105 
37.7 
219 
41.9 1 
342 
16.3 
1 80 1 
35.9 
205 
39.0 
1 313 
16.0 . 
1 81 1 
33.8 
216 
36.3 
1 287 
15.7 
I 84 
32.6 
213 ■ 
34.0 
1 268 
15.3 
1 85 
31.1 
195 
28.5 
i 233 
15.0 
86 
1 27.8 
195 
24.0 
198 
14.7 
88 
23.4 
176 
20.3 
165 
13.3 
80 
20.4 
212 
13.0 
109 
11.5 
66 
18.1 
150 
6.72 
060 
7.95 
72 
14.4 
174 
3.88 
044 
• 6.08 
53 
10.7 
119 
. 5.00 
45 
7.83 
106 
4.26 
*50 
5.57 
088 
3 . 72 
41 
t 
3.27 
41 
j 
\ 
115 
.00944 
194‘ 
.0196 
400 
.0193 
103 
950 
177 . 
203 
366 
199 
92.4 
942 
161 
202 
333 
209 
82.9 
953 
147 
207 
302 
216 
74.2 
958 
133 
220 
273 
227 
66.5 
944 
120 
226 
245 
240 
59.7 
944 
96.7 
239 
194 
262 
53.5 
930 
77.7 
240 
150 
304 
43.3 
919 
62.2 
237 
112 
331 
35.2 
887 
50.1 
228 
82 
366 
28.9 
824 
41.0 
205 
59.2 
334 
24.1 
756 
34.3 
186 
45.9 
313 
20.5 
656 
27.5 
150 
32.6 
296 
17.7 
590 
21.7 
112 
25.6 
245 
13.7 
502 
14.7 
0646 
21.0. 
186 
11.2 
386 
12.4 
0324 
1 14.0 
118 
7.2 
132 
9.8 
0387 
9.45 
069 
5.33 
95 
7.6 
0172 
6.76 
0458 
3.64 
119 
6.2 
0181 
4.59 
0262 
4.19 
0081 
3.31 
0156 
calculated from observations similar to those described above. To save 
space only one complete table is given, and for the other six experi- 
ments, are recorded merely the finally calculated decrements and the 
corresponding amplitudes. In all cases common logarithms are used. 
The results of these tables are graphically shown in Fig. 3, where 
curves are drawn corresponding to the gradually increasing initial 
amplitudes. 
