Operator 
H 
  
  
  
  
  
  
  
  
  
  
|] luminous 
The 
We believe that a 
thorough examination 
of problems raised by 
: the introduction of the 
mark will 
have considerable prac- 
IE tical importance. 
| | IT) Radial Secator. 
two-story 
The tabulation shows a) a noticeable decrease of the accidental adjustment 
error when the luminous mark with small contrast was used, and b) a still greater 
decrease of the syste- 
matic elevation error 
with small contrast. 
    
   
     
     
     
      
  
      
     
    
     
   
   
    
   
  
  
   
     
    
ro 
Point: Large contrast 
c 
1 0,70 1,57 2,31 0,25 
2 0,68 0,14 1,04 0,13 
3 1,13 (+ 0,26) | 1,64 (+ 0,33) | 2,00 (+ 0,22) | 0,21 (+ 0,11) 
4 1.75 (x 0,22) 2,60 (+ 0,44) 1,63 (+ 0,36) 0,24 (t 0,11) 
Point: Small contrast 
1 0,25 1,50 1,66 0,29 
2 0,05 0,40 0,05 0,12 
3 0,45 (+ 0,21) 1,29 Ct 0,30) 0,73 (+ 0,33) 0,03 (1 0,08) 
4 0,90 (+ 0,15) | 2,49 (+ 0,31) | 1,26 (+ 0,41) | 0,09 (+0,11) 
: slotting apparatus de- 
veloped as early as 
1944 at Jena for me- 
| chanical radial trian- 
gulation (slotted tem- 
plate method) has al- 
: ready been previously described in this magazine by the author.) 
| The Radial Secator punches precision slots from templates of suitable material. 
These slots correspond to the radial lines radiating from the image points and which 
are required for the triangulation process. The image points have been previously 
marked on the aerial photographs. | 
    
    
  
  
  
  
      
   
  
Fig.4. New model of Radial Secator for mechanical radial 
triangulation. 
  
  
1) K. Schwidefsky, Photogrammetria VII, p. 144-145, 149, Fig. 7, 1950/51. 
   
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