TRACT 26.
MEAN DENSITY OF THE EARTH
$5
o
42
o
,
O /
o
/
/
O
578
14
3
91
16
32 0
208
10
b
30
45
10
82
44
15
6
0
83
54
34 35
348
11
5
42
49
50
77
53
589
16
7
21
G9
39
38 26
435
12
5
56
53
57
74
41
613
17
9
5
64
1
41 18
564
13
6
3
58
6
70
2
605
18
9
34
55 56
44 56
625
14
5
4
64
0
66
29
510
19
10
1
48
45
49 59
706
15
5
8
67
27
65
5
527
20
9
24
41
45
54 41
703
16
4
11
73
46
65
27
486
'21
9
52
37
19
59 16
777
17
4
20
76
52
64
11
518
22
1-0
0
32 45
65 51
841
18
4
21
80
26
62
58
542
23
9
22
29
27
71 0
819
SECTION 63.
Pole
Vert. Z’sat h.
Bear,at h.
Bear,at w-
Diff. ofAlt.
Pole
Vert. Z ’s
Bear.
Bear.
Diff. of
at
P.
at
P.
at g.
Alt.
1
12
47 e
116
58
51
34
1809a
2
14
36
107
42
59
25
2135
1
6
23 d
21
51
3
13
56
101
11
65
9
2023
2
6
20
22
44 139 42
140 d
4
13
43
96
35
69
7
1960
3
6
20
24
2
136 17
1092
5
13
9
92
53
72
30
1875
4
6
14
25
20 132 35
1025
6
12
38
88
41
76
6
1760
5
5 54
27
20
127 52
932
7
12
28
■82
53
81
18
1703
6
5 41
29
231121 57
843
8
12
3
78
24
85
45
1656
7
5
21
32
27:115 58
769
9
11
47
76
54
87
30
1646
8
5
29
35
59
107 50
740
10
11
26
74
56
89
25
1592
9
5 45
41
31
87 8
615
n
10
6
68
32
96
23
1452
The three following sections were taken in a manner dif-ferent from all the rest. They ivere made by measuring ina straight sloping line, or nearly straight, from certain points,towards k and n ; and, at the beginning of the line, takingthe angle of elevation or depression of several places or points-in it, whose distance from the beginning were measured. Inthese cases, each distance is the hypotbenuse of a right-angledtriangle ; and the manner of operation is this, as radius is tothe hypothenuse, or measured slope distance, so is the sineof the elevation or depression, to the difference of altitude,and so is the cosine of the same vertical angle, to the hori-zontal distance.
section 70, from m' to k.
Pole
Slope
Vert. Z’s
Horiz.
Diff. of
4
1257
5 281
1251
116
Dist.
at m'.
Dist.
Alt.
5
1455
5 251
1449
134
6
1824
5 4
1817
157
1
463
7 501 d
459
60
Ends
2
794
6 541
788
92
at K.
3
992
6 50
985
114