FOR DETERMINING THE MEAN DENSITY OF THE EARTH. 
311 
Approximate Solution, assuming D— 0 
C = — 720 
D= 0 
E = — 240 
P=+ 180 
R=- 330 
S = — 1500 
These are applied, with signs changed, to correct the computed Logarithmic Rates 
in the Swings which are included in the last Table : and thus are formed the Cor- 
rected Logarithmic Rates” in the Table which follows next. 
28. It is impossible to give here in detail the whole of the observations of Galvanic 
Signals. The whole number of eflScient signals observed at each station was 2454 
(or 4908 observations of signals in all). It will be sufficient to give here the mean of 
each group (which, from the check described above, is extremely certain), and the 
calculations founded on those means. 
It will be remarked that the pendulums of the clocks were altered at the titnes of 
interchanging the detached pendulums; that is, between Swings 26 and 27, between 
52 and 53, and between 67 and 68. 
Mean of Times 
by Shelton. 
Mean of Times 
by Earnshaw. 
h 
m 
s 
h 
m 
s 
3 
19 
36-505 
21 
23 
28-764 
7 
19 
59-605 
1 
24 
7-486 
11 
18 
21-257 
5 
22 
44-886 
16 
3 
49-086 
10 
8 
31-307 
20 
20 
55-618 
14 
25 
54-541 
23 
34 
17-516 
17 
39 
29-336 
3 
24 
0-019 
21 
29 
26-990 
7 
19 
2-090 
1 
24 
44-423 
11 
21 
43-600 
5 
27 
41-868 
15 
52 
49-386 
9 
59 
5-459 
19 
20 
39-133 
13 
27 
8-783 
23 
20 
26-425 
17 
27 
11-971 
3 
23 
56-841 
21 
30 
58-000 
7 
22 
17-846 
1 
29 
35-058 
12 
37 
16-581 
6 
44 
54-325 
15 
17 
40-815 
9 
25 
29-184 
0 
4 
30-435 
18 
12 
53-509 
3 
38 
31-257 
21 
47 
8-990 
7 
22 
43-210 
1 
31 
35-486 
11 
20 
58-654 
5 
30 
6-754 
15 
24 
25-414 
9 
33 
49-910 
19 
21 
5-003 
13 
30 
44-920 
23 
19 
37-063 
17 
29 
32-489 
3 
20 
35-327 
21 
30 
46-555 
7 
20 
24-754 
1 
30 
51-725 
11 
20 
39-762 
5 
31 
22-579 
Approximate 
Time 
(Astronomical 
Reckoning). 
a §3 
Interval 
by Shelton. 
Interval 
by Earnshavv. 
Rate 
Earnshaw 
Shelton 
Logarithm of 
T, , Earnshaw 
Rate 
Shelton 
Corrected 
Logarithm of 
Earnshaw 
Rate 
Shelton 
1- 
2- 
3- 
4- 
5- 
6- 
7- 
8- 
9- 
lo- 
ll- 
12 - 
13- 
14- 
15- 
16 
17 
18- 
19- 
20 - 
21 - 
22 - 
23- 
24- 
25- 
26- 
Oct. 
1 . 
2 . 
2 . 
2 . 
2 . 
2 . 
2 . 
3. 
3. 
3. 
3. 
3. 
3. 
4. 
4. 
4. 
4. 
4. 
5. 
5. 
5. 
5. 
5. 
5. 
6 . 
6 . 
h 
23 
3 
7 
11 
16 
19 
23 
3 
7 
11 
15 
19 
23 
3 
8 
11 
20 
23 
3 
7 
11 
15 
19 
23 
3 
7 
22 
21 
21 
29 
17 
25 
31 
21 
25 
22 
24 
24 
17 
24 
16 
13 
31 
21 
21 
24 
29 
30 
19 
22 
24 
24 
-4 45 
•4 17 
•3 13 
49 
55 
2 
31 
27 
59 
3 
58 
14 
23- 100 
21-652 
27-829 
6-532 
21-898 
42-503 
2-071 
41-510 
5-786 
49-747 
47-292 
30-416 
21-005 
58-735 
24- 234 
•2 40 
•8 46 49-620 
34 
44 
68 
3 
56 
58 
0 
59 
0 
0-822 
11-953 
15-444 
26-760 
39-589 
32-060 
58-264 
49-427 
15-008 
m 
0 
58' 
45 
17 
13 
49 
55 
2 
31 
28 
0 
3 
58 
15 
38-722 
37-400 
46-421 
23-234 
34-795 
57-654 
17-433 
57-445 
23-591 
3-324 
3-188 
46-029 
37-058 
19-267 
34-859 
2 40 
8 47 24-325 
34 15-481 
44 26-496 
58 31-268 
3 43-156 
56 55-010 
58 47-569 
1 14-066 
0 5-170 
0 30-854 
1-0010831 
1-0011011 
1-0010855 
1-0010827 
1-0011116 
1-0010994 
1-0010893 
1-0010944 
1-0010947 
1-0010888 
1-0011049 
1-0010686 
1-0011225 
1-0010865 
1-0011040 
1-0010979 
1-0011416 
1-0010812 
1-0011071 
1-0011225 
1-0010861 
1-0010836 
1-0010930 
1-0010942 
1-0010993 
0-00047012 
0-00047793 
0-00047117 
0-00046995 
0-00048249 
0-00047720 
0-00047282 
0-00047503 
0-00047516 
O-OOO4726O 
0-00047959 
0-00046384 
0-00048723 
0-00047160 
0-00047920 
0-00047655 
0-00049550 
0-00046930 
0-00048054 
0-00048723 
0-00047142 
0-00047034 
0 00047442 
0-00047495 
0-00047716 
0-00047387 
0-00047990 
0-00046316 
0-00047194 
0-00048790 
0-00047390 
0-00048453 
0-00048852 
