Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 88
departure, which is east, by ivrjGC. Of the course CD, the southingis expressed by CI, and the departure,which is east, by CF. Of the courseDA, the southing is expressed by KA,and the departure, which is west, by DK. It is seen from the figure, that the sum of the northings isequal to HB + BG = EG;… … 82 ELEMENTS OF SUEVEYIXG. [BOOK III of the eastings is equal to GC-\-CF =^ GF; and that the sumof the westings is equal to AH-\-DK ^ GF\ hence, the sumof the eastings is equal to the sum of the ivestings. We there-fore see, that when the survey is correct, the sum of the northingswill he equal to…
Surveying
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