A treatise of practical surveying [microform] : which is demonstrated from its first principles. Wherein every thing that is useful and curious in that art, is fully considered and explained. Particularly three new and very concise methods for determining the areas of right-lined figures, arithmetically or by calculation, as well as the geometrical ones heretofore treated of. : The whole illustrated with copper-plates. / By Robert Gibson; teacher of the mathematics. ; With alterations and amendments, adapted to the use of American surveyors.