Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 106
losure, 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 verification of thework is therefore obtained, by comparing this double… … Fig. 71. Stations. Dif. of Latitude. D. M. D. Area. + Area. A 4- cB + %l)a ^cAB B + Bs + ^p 2BsC C -Dy -h 2>iA 2ms CD D -Df + 2ed 2cmDA It is evident, that cB multiplied by 2ba, or cA, will givedouble the area of the triangle cAB. But cB and ba are both L.ofC. 100 ELEMENTS OF SURVEYIITG. [BOOK…
Surveying
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