l. 
The definition of the symbol is 
(15) Ng = 134dx, (145351 100dx, r4dx, F54dx ,  -375dy, ] -Tedy,, t 
t3dy45 -3dygz t 12dy , 9,4 *375dy,, 
The upper sign relates to the left projector, base in - right projector, 
base out. The lower sign relates to the left projector, base out - right 
projector, base in. 
For four points 
N 
(16) dr = — 
(17) N,--dy,*dy, 
where n and m take the indices in accordance with the table below depend - 
ing on radius 
n 51/41 31 21 11 
m 71 81 91101111 
14 Standard error of unit weight. 
From the normal equations the square sum [vv] is found. 
We get for base zero and thirteen points 
2 2 
2 2 N, +N 
(18) [vv] = [dxdx] + [dydy] - io li. = gos - 
(13 N, * 150 [dx])^ & (13 N, - 150 [dy])* 
3 4 
  
- 
341 250 
where the symbols have the following definitions 
-3dx -4dx - 
(19) N, = 3dx,..+4dx 4*5dx 9 4*4dx 95 *3dx i9, 108 109 
1 102 10 104 105 
-9dx, 1g 14x 11 36x 45 -5dy , 9, -4dy , 9, - 3dy | 9, *3dy |. 
t4dy o6t59Y,07*4dÿ, ogt3dY, 09-3941 1 1 -4€Y1 1 2