A treatise of practical surveying : which is demonstrated from its first principles ; wherein every thing that is useful and curious in that art, is fully considered and explained ...
Robert Gibson's textbook on practical surveying, printed by Joseph Crukshank in Philadelphia in 1789 for land surveyors and students of mathematics. The folding plates hold engraved geometry: numbered figures of triangles, traverses and field plots drawn in fine line with dotted offsets, lettered vertices and north-south baselines, usable as diagram line work or plate layouts.
