TEENS TEST AT 
HH EE E ERR 
  
  
  
a 
  
b) in view of the substantially improved efficiency of the new camera objectives, 
films as picture carriers can no longer give maximum results because their 
shrinkage is a multiple of the residual distortion of the new optics. For large 
scale precision mapping, specially prepared glass plates are therefore now used 
as picture carriers; 
c) in order to profit fully by the improved angular precision of the new object- 
ives of highest efficiency, it is necessary that stereoscopic plotters be further 
developed, such as further improvement of the optical and mechanical adjust- 
ment of the measuring system, an increase in the stability of the adjustment, the 
use of optical correcting plates for the compensation of still existing residual 
distortion errors. 
I personally believe that the tendency to increase the sizes of the photographs 
is a sign of insufficient optical and mechanical factory output. There are most 
favourable picture sizes with which a maximum of angular precision of the ray’s 
bundle can be obtained. Given highest optical manufacturing efficiency, it seems to 
me that the most suitable sizes for plates should be 15X15 cm and for films 
18X18 cm. 
Regarding the photographing equipment it is to be pointed out that the auto- 
matic serial cameras at present built in preference by the industry, do not always 
attain the desired results. Especially for the large-scale precision photogrammetry 
in the mountains it is necessary to give a wider scope to the choice of external orien- 
tation. Besides vertical photographs, one must be able also to take convergent pairs 
of photos with 100% overlap. The development of air cameras allowing a larger 
choice in the selection of the external orientation is an important claim of large- 
scale precision photogrammetry. 
In stereoscopic plotters, the photogrammetric determination of boundary 
points will play an increasingly important role. Here, as well as in air traversing, 
equipments for the automatic registration of spacial coordinates of the reconstruct- 
ed points and for the economic transformation of these coordinates into coordi- 
nates of the geodetic system of the country, have become important.