Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 75
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… … Fig. 53. 95. To find the area of a piece of ground in the form of s circle. Rule.—Measure the radius AG;then multiply the square of the radiusby 3.I4I6 (Mens., Art. 105).
Surveying
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