mean error of levelling 
mean error of identification (including error of orientation) 
mean defect of film effecting an error of levelling 
mean error of a measured elevation me,- ym? i24 f?- 
mean difference in elevation (border junction of successive models) mg —-mey2- 
maximum difference in elevation (border junction of successive models) dmax = 
In fact, this maximum difference in elevation was reached in one case. 
Details of the computation will soon be published in a publication of the German Geodetic Commission, 
Series B, No. 5? (Mitteilung No.57? des Instituts für Angervandte Geodäsie). 
Similar studies relative to the planimetric accuracy have been started with. Final resulis, not yet being 
available at present, will probably be published also in a later publication of the Institut für An- 
gemandte Geodäsie.