Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 82
known, being equal to the differencebetween the two measured lines DE and CB. Hence, bysimilar triangles, DF : FC : : DE : EA,in which proportion all the terms are known, except thefourth, which may, therefore, be regarded as found: hence,EA is determined. SECOND METHOD. 100. At the point E lay… … 78 ELEMENTS OF SURVEYING. while a second person at B aligns it on BE: the staff willthus be fixed at C. Then measure the distance BC.The two triangles BCD and CAE being similar, we have, BC : BD : : CE : EA, m which all the terms are known, except the fourth, whichmay, therefore, be regarded as…
Surveying · Navigation
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