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 97
round. The surface of ground being, in general, broken and uneven,it is impossible, without great trouble and expense, to ascertainits exact area or contents. To avoid this inconvenience, it hasbeen agreed to refer every surface to a horizontal plane: that is,to regard all its bounding lines as… … to a horizontal plane, and take for ii^^^S^S^^^^the measure of the area that part ^^% 0^^^^^^/-^^of the plane which is included be- ^^^SA^ tween the bounding horizontal lines AB, BC, CD, DA. In estimating land in this manner, the sum of the areas ofall the parts, into which a tract may be divided,…
Surveying
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