The solutions of these simple equations 
dz, = 0 
dy, — 0 
DX, 
db — —— 
n 
DY, 
dx — — 
bn 
The corrections to the preliminary X- 
39 
are 
and Y-coordinates along the 
strip are for an arbitrary point à? with the coordinates X,Y, 
: Y DY, 
0X, = —— — 
bn 
X; D Y, 
bn 
X, DX, 
RY RUE OT 9 
bn (20) 
Y.DX, 
(130) 
bn 
The corrections are added to the errors according to the expressions 
(111) and (112). The remaining (residual) error Ey and Ry after the 
corrections can therefore in an arbitrary 
principal point p be written 
By = DX, + CX, 
Ry, = DY, + CY 
p 
After substitution of the expressions for DX,, DY,, DX, and DY, 
from (111) and (112) we find for the point p with the coordinates 
X, — bp 
y 7 0 
1 p i Dp 
Ry = Z (p — à +1)d6:-16 + à dag, 1 
i=1 i=1 
l n | 
x ^ 
Los da. 
i 1 | 
i=D i=p 
Ry b > (p—i+1)da, 1: + À do, 
i=) i=l 
) 2 n 
un (n — 4 4- 1) db; iT 
n |: 1 
(131) 
) 1 n 
LS (n—i+ 
n | i=1 
(132) 
  
LS