downwards the full lines are ignored, as the signs change at the
crossing of the dotted lines instead.
E.g. H^} H8\ Hwand H16T
IV. The cofactors of the directions in a chain of quadrilaterals, ad
justed for the angle-conditions.
The directions in every quadrilateral are assumed to be observed
reciprocally, with equal weights. They are numbered in the usual
way (fig. 4).
12
5)
8)
10)
16)
I
610 (4-1)
M4 (—0
55 (-1)
3 (+1)
2
6lO
144
55
3
3
1220
288
I IO
6
4
1830
432
165
9
5
9815
72°
275
r5
6
1885
- "52
440
24
7
1165
4- 1872 (*+1)
715 (*+1)
39 \x1)
8
720 (x1)
10506
"55
63
9
- 445
1869
1870
102
10
- 275
1155
10505
165
II
- 170 (+/*-!1)
7r4 (x—i)
1870 (x1)
267(4-/*-1
12
- 105
441
1T55
432
13
65
273
7r5
- 699
H
40
l68
44°
1131
15
25
I05
275
4- 1830
16
15
63
165
4-10569
r7
10
42
4- 110
1974
18
4- 5
21
55
987
19
5
21
55
987
34
37r5 3T
3024 29
3025 23
4- 2961
3»
610 38
144 38
55 38
3
T/7+1
Fig. 4