It actually has been worked out. If i recall from my survey course in Nebraska, the base unit is 36 sections (6 miles x 6 mile). One of the section (lower right maybe?) is actually not square and not a full 640 acres. This is where the error in the curvature of the earth has been accounted. If you find the USGS survey maps of the US (probably in a depository library) then you can find the main parallels and see the one section in every 6x6 section square is somewhat trapezoidal spaced.
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Today's Featured Article - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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