A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 80
suring the perpendiculars let fall on itfrom each angle of the field, and thus dividing the whole area into trianglesand trapezoids, as in Fig. 41. The line on which the perpendiculars are to be let fall may also be out-side of the field, as in Fig. 42. Such a survey can be platted very readily,… … Offsets.97. Offsets are short perpendiculars, measured from a straightline, to the angles of a crooked or zigzag line near which thestraight line runs. Thus, in the FlG ^1# figure, let A C D B be a crooked C fence, bounding one side of a field.Chain along the straight line A B,which runs from one…
Surveying
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