Photogrammetria, XIX, No. 6 
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of them is achieved by adequate changes of the scale parameters V and W. As a result of 
the evaluation (for the critical frequency range only) and of the solution of equations (7) 
and (8) following values are obtained: (fig. 12). 
Fig. 12. 
Diagram of the 
evaluated disturbing 
effects. 
The group d, referring to the projection, is subdivided into two components: d c is the 
part which is common to both projectors, while d p is different for each of them. In practice 
we know the combined effects d' and d" only, which are the cumulative sums of their com 
ponents. 
The consequences of the groups X, l and r, t in the output depend on the ranges of the 
scale parameters V and W. These ranges should also be taken into consideration in the 
representation of the results. 
S d 
groups in the projection. 
Fig. 13b. Representation of the d and D 
groups on the drawing table. 
EsÌ 
f* 
Fig. 13c. Representation of the 6 and D groups on the drawing table.