190 
IOWA ACADEMY OF SCIENCE 
it is still very instructive as to the information it gives as to the damp- 
ing. The following values for the decrement (cf. tables 3 and 4) were 
TABLE 3. 
Length, 40.2 cms. Moment of inertia, 980 g. cml 
M-N 
Am. 
An. 
Log. Am. 
Log. An. 
Log. 
Am. -An. 
1 
Log. Dec. 
Mean 
Amp. 
4 
639 
526 
2.8055 
2.7210 
.0845 
1 
.0211 
582 
4 
582 
476 
.7649 
.6776 
.0873 
.0218 
526 
4 
526 
427 
.7210 
.6304 
.0906 
.0227 
476 
4 
476 
381 
.6'r<6 
.5809 
.0967 
.0242 ! 
427 
4 _____ 
427 
337 
.6304 
.5276 
.1028 
. 0257 
381 
4 
381 
295 
.5809 
.4698 
.1111 
.0278 
337 
4 
295 
220 
.4698 
.3424 
.1274 
.0319- 
256 
4 __ _ 
220 
158 
.3424 
.1987 
.1437 
. 0359 
188 
4 _ _ 
158 
no 
.1987 
.0414 
.1573 
.0.393 
1.32 
4 
no 
75 
.0414 
1.8751 
.1663 
.0416 
90.7 
4 ___ 
75 
53 
1.8751 
.7243 
.1508 
.0377 
62.3 
8 
62.3 
33.8 
.7945 
.5289 
.2656 
.0332 
44.4 
11 
53.2 
26.3 
.7259 
.4200 
.3059 
.0278 i 
38.4 
14 
44.4 
21.9 
.6474 
.3404 
.3070 
.0219 ! 
.33.8 
17 
38.4 
19.3 
.5843 
.2856 
.2987 
.0176 i 
26.3 
20 
33.8 
16.9 
.5289 
.2279 
.3010 
.0151 
21.9 
20 _ _ 
16.9 
12.3 
.2279 
.0899 
.1380 
.0069 
14.2 
20 
12.3 
10.1 
.0899 
.0043 
* .0856 
.0043 i 
11.1 
40 
10.1 
8.0 
.0043 
0.9031 
.1012 
.0025 1 
9.0 
145 
8.0 
4.54 
0.9031 
.6571 
.2460 
.0017 ! 
5.82 
159 ___ 
4.54 
3.21 
.6571 
.5065 
.1506 
1 
.0009 
3.80 
I 
