. A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects. 45 £. CD °30W. DE EA Area in acres, )) The operator can rely on therule used in the last operation,whatever be the number of sides,or whatever be the shape of thefigure, provided that the lines areright lines, from one angular pointto ano
. A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects. 45 £. CD °30W. DE EA Area in acres, )) The operator can rely on therule used in the last operation,whatever be the number of sides,or whatever be the shape of thefigure, provided that the lines areright lines, from one angular pointto another. In case of re-entering angles,like HI A, represented in the ad-joining figure, a portion of thefigure Air, is reckoned twice. Butthis is corrected by the subtractivespace HIih, which includes notonly the exterior portion hHIA,but also the whole additive trian-gle AH, belonging to the last sideof the figure I A. In the following example are several such re-entering angles. 2. Find the area of a lot of land, of which the following are thefield notes. Beginning at the south west corner, the ancient land mark; thence 1. JST. 27° 15 E. distance chai] 2. S. 80° 00 E. 3. S. 69° 00 E. <⢠4. S. 15°45TT. tx 5. W. 66° 45 W. a 6. S. 31° 00 W. t( 7. K 70° 45 W. a 8. S. 41° 45TF. < S. 80° 00 E. â 4- 1-131 19500 J \ S. 69° 00 E. â t IS. 15° 45 W. â â I > N. 66° 45 W. â ( ] S. 31° 00 W. â
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Keywords: ., boo, bookcentury1800, booksubjectnavigation, booksubjectsurveying
