Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 74
offsetsmeasured from these lines,as often as may be requiredto afford data for the compu-tation of the area and a true delineation of the boundary. In the case represented in thefigure, the stream from A to C is the boundary. The stationB is selected for convenience, as it is evident, if the line… … 68 ELEMEIJ^TS OF SURVEYING. [book II. that the areas thus cut off may be considered as Veing boundedby straight lines, without sensible error. When the boundary is acrooked stream that is easilycrossed, it is often convenientto survey a line across thebend, as in the figure, andlocate by offsets…
Surveying
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