IOWA ACADEMY OF SCIENCE 
193 
Xo. 
Amp. 
Period 
No. 
Amp. 1 
Period 
. 
0 
73.3 
5.765 
0 
20.7 
1 5.425 
10 
30.0 
.580 
6 
14.0 
1 .375 
12 
21.4 
.509 
10 
11.4 
i .348 
20 
13.9 
.403 
14 
9.6 
I .320 
2C 
10.2 
.342 
16 
8.6 
.308 
30 
8.7 
.315 
20 
7'. 8 
.292 
3() 
7.2 
.289 
24 
6.9 
.280 
40 
6.4 
.277 
26 
6.6 
.275 
50 
5.2 
.256 
30 
6.1 
.265 
55 
4.8 
.250 
35 
5.4 
.257 
60 
4.4 
.245 
40 
5.0 
1 .250 
70 
3.9 
.241 
45 
4.6 
! .245 
80 
3.4 
.239 
i 50 
4.3 
1 .240 
90 
3.2 
.236 
i 60 
3.8 
! .235 
100 
3.0 
.235 
i ‘0 
3.4 
! .238 
115 
2.8 
.232 
1 80 
3.2 
1 .232 
125 
2.7 
.230 
! 90 
3.0 
i .230 
135 
2.6 
.228 
100 
2.8 
! .228 
142 
2.62 
.225 
157 
2.01 
1 .222 
238 : 
1.49 
.222 
220 
1.66 
1 .222 
i 
ritlimic decrement relations in table 6-Fig. 5. In table ^ , 
corresponding’ to those in table 2 for the preceding set of expcx. 
A comparison of the two tables [Tables 2 and 5 (b)] will clearly bring 
out the essential differences between these two sets of experiments. 
TABLE 5-(b). 
1 
0° 
1 
't 
Vibrations 
1 to 5° 
Dec. 7 . . 
239 
620 
114 
Dec. 9 
75.5 
407 
75 
Dec. 10 
54 
335 
63 
Dec 11 
36.7 
286 
52 
Dec. 12 
10.4 
212 
40 
13 
