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A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)

Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 168

An illustration from A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart, 1875, leaf 168
will be in aproper direction. Mark off its length, and plat the next and thesucceeding bearings in the same manner. -+ (268) When the plat of a survey does not close, it may becorrected as follows. Let Fig. i83. ABODE be the boundarylines platted according tothe given bearmgs anddistances, and… … A<<1 162 COMPASS SURVEYIIVG. fPART ;iJ ground, or was specially uncertain in its direction wlien observed.The inaccuracy must then be distributed among all the lines in■proportion to their length. Each point in the figure, B, C, D, E, mustbe moved in a direction parallel to EA, by a certain…

Surveying

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