Translation of paper published in “Bildmessung und Luftbildwesen”” 40, 1792 
  
Invited paper for Commission III 
XII. International Congress of Photogrammetry Ottawa 1972 
Theoretical Accuracy Models for Block Triangulation 
by H. EBNER, Stuttgart 
  
Herbert Wichmann Verlag GmbH, 75 Karlsruhe 21, Rheinstraße 122