the point 14,55 is designated by tlie letter a, as shown in the figure, which 

 also shows the distances designated by b, c and (/. ïhe operations involved 

 in the complète investigation of the réseau are then the following: 



1. Comparison of every line with a stretched spider line, to détermine its 



„sinuosity", or departure from an ideal straight line. 



2. Determination of the „projection error" of the Repsold machine. 



3. Intercomparison of the distances: 



o[55]o,;, o[43]o6, o[3l]oo, 



4. Intercomparison of the distances: 



3,[2].v., 3l[14].„, 3l[26],,„ 



5. Comparison of: 



3l[li]K with o[43]20 



3,[2]k with o[31]2,; 

 3i[26]55 with o[55ja; 



6. Comparison of each point along the lines: 



2, 14, 26, 31, 43, 55, 



with the subdivisions of the standard scale A of the Repsold measuring 

 machine. 



7. Intercomparison of the distances a, b, c, ä, to détermine the angle between 



the lines 14 and 43. 



