the mean Denjity of the Earth i 769 
belonging to each line or ring, which being all added 
together, their total is placed at the bottom of the co- 
lumn : after this follow the twelve columns of differences 
before mentioned, which are fucceeded by one more co- 
lumn containing the fums of each line of thefe differ- 
ences, which fums being added together, their total is 
placed at the bottom of them ; and this total is the fum 
of all the differences between the fines and the tangents, 
and it is therefore fubtraffed from the total of the tan- 
gents in the fourth column, when there remains the fum 
of the fines as required. 
1 . For the fum of the fines of alt. above 0 in the 
N.W. quarter. 
Rings. 
Radii. 
Sum of 
Perpsn. 
34-2- 
Sum of 
Tang. 
1 
2 
3 
4 
5 
6 
7 
8 
1 
9 1 10 
j 
II 
12 
iSurn of 
Diff. 
I 
333t 
2175 
6-525 
103 
103 
103 
103 
97 
97 
86 
75 
55)36 
20 
5 
•883 
2 
1000 
6265 
6*265 
88 
90 
88 
85 
84 
82 
78 
75 
56I40 
20 
4 
790 
3 
1667 
10045 
6*027 
79 
86 
87 
87 
88 
97 
93 
64: 
48(21 
7 
1 
758 
. 4 
2333 
9300 
3-986 
12 
12 
*3 
17 
23 
27 
39 
43 
45] 16 
4 
251 
5 
3000 
7275 
2*425 
1 
1 
2 
3 
6 
1 1 
16 
z 7l I 3 
3 
83 
6 
3667 
4695 
1*280 
1 
1 
3 
7 1 9 1 
2 
23 
7 
4333 
2735 
0-631 
1 
1 1 3 1 
1 
6 
8 
5 °°o 
1625 
0-325 
hi 
1 
2 
9 
5667 
670 
o-ii8 
1 1 
10 
6333 
60 
0*009 
1 
1 1 
27*591 = fum of tangents. Sum of diff. | 2*796 
2*796 = fum of the difF. 
24*795 zr fum of the lines of alt. above o in the N.W. 
quarter. 
s c 
Vol. LXVHI 
