STRAIN ON THE PHYSICAL PROPERTIES OF MATTER. 
809 
Experiment II. 
A tin wire, as pure as could be obtained by the ordinary process of distillation, 
607’3 centims. in length and ‘04972 centim. in diameter, tested about two 
months after suspension, having been in the meantime vibrated almost every 
day. Time of a single vibration, 3‘898 seconds. 
Number 
of are. 
Observed arc in 
scale-divisions. 
Pairs between which 
the differences of 
logarithms are taken. 
Difference of 
logarithms. 
Logarithmic decrement 
for three vibrations.* 
1 
2 
170-2 
160-2 
1—4 
•06926 
3 
4 
150-1 
145-1 
2—5 
•07396 
■07190 
5 
6 
135-0 
127‘0 
3—6 
•07246 
7 
8 
123-1 
116-0 
7—10 
•05550 
9 
10 
112-1 
108-0 
8—11 
•06016 
■06392 
11 
12 
101-0 
94-1 
9—12 
•07611 
13 
14 
90-0 
85-1 
13—16 
•06779 
15 
16 
81-0 
77-0 
14—17 
•06613 
•06578 
17 
18 
73-0 
70-0 
15—18 
■06343 
19 
20 
68-0 
67-0 
19—22 
•06907 
21 
22 
64"0 
58-0 
20—23 
•09375 
•08160 
23 
24 
54-0 
53-0 
21—24 
•08197 
25 
26 
51-0 
49-0 
25—28 
•04481 
27 
28 
470 
46-0 
26—29 
•04675 
•05387 
29 
30 
44"0 
40-0 
27—30 
•07004 
31 
32 
38-0 
37-0 
31—34 
•06127 
33 
34 
35-0 
33-0 
32—35 
•07684 
•06835 
35 
36 
310 
30-0 
33—36 
•06695 
Mean 
•06757 
* The great variations which occur in the numbers in this column I afterwards found to be entirely 
due to the fact that in this case the period of torsional vibration was nearly synchronous with the 
period of pendulous vibration. (See note on pp. 809, 810.) 
MDCCCLXXXVI. 
0 L 
