Boning

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A method used by carpenters and masons to determine whether a surface is in or out of wind. It consists in placing two similar straight edges on the surface, parallel to each other, and sighting over their upper edges to see if they coincide. If they do not, the surface is in wind.

Based on Glossary of Bridge Terminology; Chapter LXXX of J.A.L. Waddell's Bridge Engineering (New York: Wiley, 1916)