165 
1918-19.] The Propagation of Earthquake Waves. 
The remaining elemental strips of width 05 are then grouped in sets 
of six, and the area of each set is calculated by Weddle’s Rule, namely, 
area = + % + u z + ^4 + ^6 + 5( m i + + u b)} fo 
10 
In the present case we apply Weddle’s Rule from p=14*5 to p=lP5, from 
p — 175 to p = 205, from p= 205 to p = 23’5, and from p = 23‘5 to p = 26 5. 
Table III. — Showing the Calculations of the Elements of the Integral (11) 
from jp = 14 to p = 28. 
m=;- 
II 
EH 
co 1^ 
s /(' P 2 - v 2 ). 
1 
f(p)J s / iP * ~ v 2 )- 
0 
28 
24-3 
o-ooo 
1-25 
27*5 
23-7 
053 
2-35 
27 
23-1 
•102 
3-3 
26-5 
22-5 
•147 
4-2 
26 
21-9 
•192 
5 
25-5 
21-3 
•234 
5*65 
25 
20-7 
• -273 
6*3 
24-5 
20-1 
•313 
6 ’85 
24 
19-5 
* -351 
7-4 
23-5 
18-9 
•392 
8 
23 
18-3 
•438 
8-6 , 
22-5 
17-6 * 
•489 
9-1 
22 
17-0 
•535 
96 
21*5 
16-3 
•588 
10-2 
21 
15-7 
•650 
10*75 
20-5 
15-0 
•718 
11-4 
20 
14-3 
•798 
12 
195 
13-6 
•885 
12-6 
19 
12-8 
•981 
13-25 
18-5 
12-1 
1-094 
13-95 
18 
11-3 
1-234 
14-7 
17-5 
10-5 
1-400 
15-3 
17 
9-64 
1-587 
15-85 
16-5 
8-73 
1-816 
1635 
16 
7-75 
2T10 
17T 
15-5 
6-65 
2571 1 
18-2 
15 
5-39 
3 377 
19T 
14 - 5 
3-77 
5066 
19-25 
14-4 
3-37 
5-712 
19-35 
14-3 
2-91 
7-650 
19-50 
14-2 
2-37 
8-228 
19*75 
14-1 
1-68 
11-756 
20 
14 
0 
00 
This leaves three elemental strips still to be summed together, and for 
this the formula to be used is 
area= 3K±3» 
8 
The method is in all cases to begin at the lower end and mark off in 
sets of seven, so that Weddle’s Rule may be applied. If there be left over 
