the mean Denfity of the Earth. 743 
0 / 
J 3 5 6 
0 / 
O / 
8 
0 / 
°o 'i 
1 ' 
1656 
3 
101 11 
&S 9 
2O23 
12 3 
78 24 
85 45 
4 
*3 43 
9 6 35 
69 7 
i960 
9 
11 47 
76 54 
87 30 
i 1646 
5 
*3 9 
92 53 
72 30 
187s 
10 
1 1 26 
74 5 6 
89 25 
J 592 
6 
7 
12 38 
12 28 
88 41 
82 S3 
76 fc 
81 18 
1760 
1703 
1 1 
10 6 
68 32 
96 23 
1452 
The three following factions were taken in a manner 
different from all the reft. They were made by mea- 
furing in a ftreight Hoping line (or nearly ftreight) from 
certain points towards K and n, and at the beginning of 
the line taking the angle of elevation or depreffion of fe~ 
veral places or points in it, whofe diftance from the be- 
ginning were meafured. In thefe cafes each diftance is 
the hypothenufe of a right-angled triangle, and the 
manner of operation is this, as radius is to the hypothe- 
nufe or meafured flope diftance, fo is the fine of the ele- 
vation or depreffion to the difference of altitude, and fb 
is the cofine of the fame vertical angle to the horizontal 
diftance. ' 
section 70, from m' to k. 
Slope 
Vert. z.’s 
Horiz. 
Diff.of 
4 
l2 57 
0 / 
5 *8f 
1251 
I 16 
tr oie. 
Dift. 
at m'. 
Dift. 
Alt. 
5 
1455 1 
5 2 Si 
1449 
*34 
I 
463 
7 
459 
60 
6 
1824 
5 4 
OO 
'■a 
157 
2 
794 
6 54 z 
788 
92 
Ends 
at k. 
992 
6 50 
985 . 
114 
4Z 
Vol. LXVIII. 
