The combined width of all three divisions is ~50 miles. If this plan was drawn to scale, the left level would be angled up 0.36⁰, the center would be horizontal, and the right would be angled down 0.36⁰. The angles are so small because Earth is really big, and 50 miles is just a small fraction of its circumference. I’m sure it’d be a pain to draw, and it would not convey any useful information (you probably wouldn’t even notice it with the naked eye). So the surveyor draws the level straight ... Read even more
