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A portable surveying instrument consisting essentially of a drawing board and a ruler mounted on a tripod and used to sight and map topographical details.
(Surveying) a surveying instrument consisting of a drawing board mounted on adjustable legs, and used in the field for plotting measurements directly
(Surveying) to survey (a plot of land) using a plane table
a drawing board mounted on a tripod, used in the field, with an alidade, for surveying tracts of land.