TRACT 26.
MEAN DENSITY OF THE EARTH.
59
15. For the sum of the sines below r in the s.\v. quarter.
Rings
Radii.
Sum ofDeps.
3 -f 2 —Sum ofTangs.
1
2 3 4> 5 6
7
8 9
10
11
12
Sum ofDiffs.
9
5 667
620
051
.
0
.
10
6333
1730
273
. 1 . . .
•
•001
11
7000
3030
433
1
. . • « •
1
.
2
12
7667
4470
5S3
1 . . . .
1
2
13
8333
4660
559
. . 1 . .
.
2
14
9000
3720
414
. . 1 . .
•
1
2
15
9667
2390
247
.
l
•
1
16
10333
U 60
141
. • • • •
.
1
17
11000
800
73
• • » • •
.
18
116 ' 6'7
130
11
•
2785 a
z sum of the tangents.
•011
•Oil =
z sum of the differences.
2774 :
z sum of the sines.
16 . For the sum of the sines below p in
the s.E. quarter.
1
2 3 4 5 6
7 8 9
10
11
12
7
4333
SO
• 01 s
0
8
5000
290
58
.
m
.
.
9
5667
1810
319
•001
10
6333
3280
518
• 1 . . .
1 .
0
,
2
a
7000
4640
66.1
1 ... 1
•
,
1
3
12
7667
5590
729
. 1 . . 1
.
1
3
13
8333
5830
700
. . 1 . .
1 .
1
3
14
9000
5700
633
. . 1 . .
.. 1
#
1
•
3
15
9667
5240
542
1 .
1
.
1
3
Vi
10333
4560
441
. 1
#
1
2
17
11000
3920
356'
_
1
1
2
18
116 ' 6'7
3180
273
.
1
1
19
12333
2630
213
1
,
1
2°
13000
2230
172
1
.
1
5-035 =
z sum of the tangents.
■025
•025 =
z sum of the differences.
5 -610 =
z sum of the sines.