TRACT 26.
MEAN DENSITY OF THE EARTH.
53
1. For the sum of the sines of alt. above 0 in the N.w. quarter.
Rings
Radii.
Sum ofPerps.
3-f 2=Sum ofTangs.
1
2
3
4
5 67
.8 9
10
11
12
Sum ofDiffs. ?
i
333i
2175
6-525
103
103
103
103
97 97 86 75 55
36 20
5
•8831
2
1000
6265
6-265
88
go
88
85
84 82 78 "75 56 40
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
13
17
23 27 39 43 45
16
4
.
- 251
5
3000
7275
2-425
•
1
1
2
3 6 11
16 27
13
3
83
6
3667
4695
1-280
•
.
• 1 J
3 7
9
2
23
7
4333
2735
0-631
c
•• ,
• • * .
1 1
3
1
6
8
5000
1625
0-325
1
1
4
2 K
9
5667
670
0-118
, ,
10
6333
60
0-009
■ i
27-591
= sum of tangents.
2-795
2.796
~ sum of the diffs.
24-795
— sum of the
sines of alt. above 0 in the n.w. quar-
ter.
2. For the sum of the sines above 0 in the N.E. quarter.
1
1
2
4
5 6' 7
8 9
10
11
12
1
333-J-
1965
5-395
97
92
92
87
80 71 56 43 33
21
15
5
•695
2
1000
5360
5-360
68
67
65
62
59 56 53
43 35
23
9
1
541
3
1667
82/5
4-g65
66
53
51
.49
47 41 36'
31 25
20
13
1
’ 433
4
2333
7555
3-238
IO
IO
IO
xo
10 11 12
14 15
13
8
1
124
5
3000
4410
1-470
.
111
2 2
2
4
t
13
6
36 67
1937.
•528
1
1
2
7
4333
580
•134
8
5000
50
•010
21-600
= sum of the tangents.
,
1-808
1-808
sum of the differences.
19-792
— sum of the
sines.