TRACT 26
MEAN DENSITY OF THE EARTH
2b
O /
O /
10
13 35
47 9
782
11
15 19
48 54
955
12
16 29
50 12
1093
13
17 .8
51 1
1171 !
14
17 27
51 48
1248
SECTION 7.
Pole
Vert. Z’s
Bearings
Diff. of
at x.
at s.
Alt.
o •
1
7 30 d
9 30
60 d
2
1 49
15 52
24
3
2 5 e'
20 49
52 a
4
4 30
24 48
135
5
5 41
28 23
208 '
6
7 13
30 27
297
7
8 14
32 29
380
8
9 24
33 41
465
9
10 26
35 0
558
10
11 41
36 21
678
11
12 36
37 15
773
12
13 31
38 17
885
13
13 46
39 30
973
14
13 56
40 17
1036
SECTION 8.
Vert. Z*s
Bearings
Diff. of
at a.
at b<
Alt.
1
17 56£d
37 12
516 D
2
10 12f
41 50
359
3
5 41
44 48
229
4
2 25
47 2
107
5
0 29
49 6
20
6
1 12 E
51 0
74 a
7
3 0
52 351
198
8
5 0
54 441
378
9
6 18
55 561
520
10
7 2
56 47j
620
11
8 52
57 24
821
12
10 10
57 551
986
13
11 24
58 28
1160
14
12 201
58 58
1316
N. B. The place of this last pole
would seem to be the same as n the
Western cairn,
as the section was
directed throug
h it. But then the
last number 1316 is too great; as,
from all other measures, the diff. in
alt
between a
and n is only 1303
feet. This diff. of 13 feet seems to
be caused by the last bearing being
about 7'too great, for in other places
this angle is only 58° 51'.
And in- |
deed many other angles taken at thesame time with tne above seem to bemuch wrong, as they greatly differfrom corresponding ones taken atother times.
Such differences among corre-sponding angles I often met with inthe measures contained in the booksof the survey, and it required muchcare to detect them, and trouble toreconcile them.
section 9.
Pole
1
0
'3
4
5
6
7
8
9
10
11
12
13
14
Bearingsat a.
132 2'li130 27127 26124 251119 61111 37103 45195 25
85 55
78 2i73 14
71 41170 381■ 69 39
Bearingsat s.
36 45-J
37 34§
39 8
40 18
43 19
48 7
52 58
58 50
67 54
75 58182 30
86 21
89 33
92 23
This is a horizontal or level sectionthrough A, and therefore each point isfeet (the height of the theodolite)above that point.
SECTION 10.
Vert. /’s
Bearings
Diff. of
at A.
at b.
Alt.
0 /
O •
1
19 41 d
51 12
531 d
2
13 52
57 221
426
3
8 7$
62 56
295
4
2 30
68 47
106
5
0 59
73 551
47
6
0 221e
76 52
27 a
7
0 59
79 141
70
8
1 39
81 7
124
9
2 25
82 42
194
10
3 5
84 12
266
11
3 36
85 411
338
12
3 48
86 27
373
SECTION 11.
Vert. /’s
Bearings
Diff. of
at d.
at c.
Alt.
0 /
O /
1
12 56 d
48 18
231 d
2
9 50
62 4
334