correction lines

correction lines

Provisions in the public land survey system made to correct for the curvature of the earth; one cannot have perfect rectangles over a curved surface. Every fourth township line (24 miles apart) is used as a correction line on which the spaces between the east and west range lines are corrected to a full and proper 6 miles.The effect is that the grid lines do not match up until they meet at the principal meridian.

References in periodicals archive ?
Correction lines; essays on land, Leopold, and conservation.
Correction Lines: Essays on Land, Leopold, and Conservation Curt Meine Washington, DC:Island Press, 2004.
It follows much the same trajectory correction lines as the Excalibur but it is anticipated that ranges of well over 80,000 metres will be achieved, thanks partially to rocket assistance.