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 134
re, the doublemeridian distances, estimated to the east are plus, and thoseon the west, must be taken with the minus sign. The double meridian distance of the last course should beequal to the departure of that course. A yerification of thework is therefore obtained, by comparing this double… … stations. Dif. of Latitude. D. M. D. Area. + 1 Area. 1 + cB + Ua ZcAB 2* + Bs + ^P 2BsC 3 -yD + 2/i7i 2visCD 4 -Df + Zed 2cmDA It is evident, that cB multiplied by 2I)a = cA, will giyedouble the area of the triangle cAB. But cB and ba are bothplus; hence, the product will be pjlus, and must be put…
Surveying
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