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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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