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Reference.org
Plane table
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<p>A plane table (plain table prior to 1830) is a device used in <a href="/facts/Surveying/qchGcnRC">surveying</a>, site mapping, exploration mapping, coastal navigation mapping, and related disciplines to provide a solid and level surface on which to make field drawings, charts and maps. The early use of the name <i>plain table</i> reflected its simplicity and plainness rather than its flatness. "Plane" refers to the table being both flat and levelled (<a href="/facts/Horizontal_plane/Hhsu9C8x">horizontal</a>). </p>