Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 109
106 ELEMENTS OF SURVEYING. [BOOK II. 60. When the honnd-ary is a crooked streamthat is easily crossed, itis often conyenient tosurvey a line across thebend, as in the figure,and locate by offsetsupon both sides of theline. In any case, thesmall areas to be com-j)uted are only trape-zoids and… … PEOBLEM Tin.61. To find the area of a piece of ground in the form of a circle. EuLE.—Measure the radius AG: thenmiiltiphj the square of the radius hy3.1416 (Mens., Art. 105). To find the area of a circular piece of land, of which thediameter is 25 ch. Ans. 4:9 A. 0 E. 14: P.
Surveying
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