consider 
y and Af). 
nient, be- 
lements of 
onomical 
advantage 
onsider the 
^: 100. 
truments of | 
  
  
     
   
AU, = EA JAY XV 
WV, s ZW «fA + KR, 
The unresumed external orientation of photoéraphs causes. the following displace- 
ments: 
SU = dd 4 A42, 
du = i41, * 4X, # Kd, 
The common displacement of both vectors comes to: = 
di, pe To Zo) e ARA) + h (FZ + FE) 
al V, = B+, = ER dN )e J (FN I x)» K(VE, «d Z, ) 
E (he originadty crossing rays 7: and Vs became fleeting: 
y1 = A + dV, and 74 = FA + dV, 
Let us move the right. ray 8 f.e.in direction of the axis y so, as it 
touches the ray 71. We can cause this displacement by the element dj, or dby,. 
The:point of intersection, . we: get, represents the displaced position of the 
point 7'(xjyjz). The difference from the correct position are the components 
dx,dy and dz. 
The position of the peint T'can be deter- 
mined by projechine the rays 7| and Y] on the 
plain (XZ) (Fig.3). The projection on this plain 
remains unvariable, if we move the rays in di- 
rection of the axis y. 
The condition of the point of intersection 
of both projective (homological) rays, that de- 
termines the position of the point 7’on the / 
plain (XZ), can be expressed by the folloving | / 
equation: | 
  
o» 
AV" "6-0 | / 
7(xz) al 2(xz) 
Fig. 5 
We are going to write the same equation for both components separately: 
A (X PX s I) - m OX on + PX, + dX, ) = bx 
AMZ + PZ +0 Z,)-((Z:bz PE +E) = 82