What is the test for determining where a central mound is placed between two sections?

The questions that arise here are practically the questions that presented themselves to Wetmore, C.J., in Rohrke v. Marshall (1910), 3 S.L.R. 82, summarised by the Chief Justice in that case as follows at p. 83:— "(a) Was a central mound placed between the two section-corner mounds indicating where the line between the two quarter-sections in question should start? (b) If there was, where was it placed? (c) If no central mound was placed or can be found, where is the dividing line between these quarter-sections located?"