To keep the range lines as nearly as possible six miles apart, a correction line is made as the line continues north. This correction is made every 24 miles.
Explain Correction line
Correction line is a method of correcting errors brought on by the earth's curvature in the Government Rectangular Survey System. The distances between the north and south range lines are re-measured and corrected to a full six miles every fourth township line, which is spaced at intervals of 24 miles.
As the world is a sphere, All of your northbound roads will eventually come together at the North Pole if you arrange neat meridian lines starting at a particular latitude and moving north. Then, your lovely square, ten-acre plots will gradually morph into trapezoids before disappearing entirely into a triangle.
The north road markers now include correction lines supplied by the Dominion Land Survey. Every 24 miles, the Land Survey placed correction lines—roads that jog the meridians east or west. The adjustment is almost a mile long. The nicest thing is that you know how frequently you need to modify. Directions go north, square plots stay nearly square, and so on.
To keep the range lines as nearly as possible six miles apart, a correction line is made as the line continues north. This correction is made every 24 miles.
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