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Originally Posted by RAP
As regards heights - have you studied the O.S maps -that what they would have had at the time. I imagine calcuations were made from contour lines.
RAP
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Pretty much what I was going to post. As this was presumably a comparatively rural area, the organisers would probably have used 2½ inch (or even 1 inch) maps to make their calculations: even using the largest available (probably 6 inch) would leave quite a margin of error, especially when calculating distance between two points at different heights - unless one or both were trig points there cannot be an accurate measure.
Chances are that they'd have actually used a simple measuring wheel, starting at point A and finishing at point B. On the ground. Much more accurate than trying to calculate it with a map ....