1918-19.], The Propagation of Earthquake Waves. 
169 
Table V. — Secondary Wave. 
In Degrees. 
In Radians. 
Integral 
(11). 
Log — to 
r 
Base 10. 
Radial 
Distance, 
R. 
kilom. 
Velocity 
=R/u. 
kilom. 
sec. 
2a. 
??• 
2a. 
77- 
0*0 
28 
0 000 
1604 
o-ooo 
•ooooo 
6378 
3-98 
2*5 
27 
0*022 
1547 
0-433 
•00209 
6348 
4T0 
8*4 
26 
*073 
1490 
1*141 
•00551 
6298 
4-22 
11*3 
25 
*097 
1432 
1-818 
•00874 
6251 
4-37 
13*7 
24 
*120 
1375 
2-799 
•01351 
6183 
4*50 
160 
23 
T40 
1318 
3-691 
•01781 
6122 
4-65 
18*2 
22 
*159 
1261 
4-824 
•02328 
6045 
4-79 
20*4 
21 
T78 
1203 
5-957 
•02875 
5970 
4-97 
22*8 
20 
T99 
1146 
7-211 
•03480 
5887 
5T4 
25*2 
19 
*220 
1089 
8-533 
•04118 
5788 
5-32 
27*9 
18 
•243 
1031 
10-044 
*04847 
5705 
5-53 
30*6 
17 
*267 
974 
11-761 
•05675 
5618 
5-77 
■32*7 
16 
•285 
917 
13 533 
•06530 
5488 
5-98 
1 36*4 
15 
•318 
859 
15-631 
07543 
5361 
6-24 
| 40*0 
14 
•349 
802 
18T11 
•08739 
5216 
6-50 
j 46*2 
13 
•403 
745 
2117 
T0214 
5042 
6-77 
53*4 
12*5 
•463 
716 
23-21 
•11198 
4929 
6-88 
! 71 
12 
•620 
688 
27-17 
'13113 
4716 
6*85 
86 
11 
*750 
630 
35-36 
T7062 
4306 
6-84 
I 97 
10 
•846 
573 
43-82 
•21143 
3920 
6-84 
| 107 
9 
933 
516 
53-10 
•25625 
3536 
6 85 
117 
8 
1*021 
458 
63-81 
•30794 
3139 
6-85 
! 127 
7 
1T08 
401 
77-27 
•37285- 
2703 
6*74 
1 137 
6 
1T95 
344 
89-80 
•43335 
2352 
6*84 
j 147 
5 
1-202 
287 
107-62 
•51932 
1929 
6-72 
It will be noticed that each of the curves is almost exactly a straight 
line from It = 6300 km. to R= 5700 km. Between It = 5700 and ft = 5600 
there is a distinct bend, and then the graph is again approximately recti- 
linear to about It = 5000 km. For values of R lower than 4700 km. v 
becomes fairly constant. The uncertainties in the observational data for 
arcs of transit greater than 100° prevent us attaching any importance to 
the variations in v in the deeper layers. The fourth figure in the values 
of v has not been retained throughout, for it is quite clear that the third 
figure may be in error by several units. 
Working out the linear relation between the speed v and the distance 
R by the method of least squares for the two portions of each curve, we 
find as follows : 
A. The Primary Wave. 
From R = 6250 to R = 5710 the velocity in km. per sec. is given by 
velocity = 32*78 - *0040 R. 
From R = 5620 to R = 4790 
velocity = 28*27 - *0032 R. 
