28 ANALYTICAL AERIAL TRIANGULATION, DISCUSSION 
The CHAIRMAN: Thank you, Mr Tewinkel. 
Now, as the time is over I will have to close the 
discussion. I wish only to conclude that it is 
impossible to make any conclusion about this 
very interesting discussion because till now any- 
body supports his own theory on analytical 
triangulation. However, I believe that the ques- 
tion is now posed and I hope the next inter- 
national photogrammetric congress will be able 
to have much more experience in analytic 
triangulation and be able to judge the results in 
a more complete manner.