A complete treatise on practical land-surveying, in seven parts; . Double areas collected. 50154 sum. Offsets taken on the line C A, 232 72 252 55 45 37 1060 117 1764 LC 106 756 11660 7 2 9324 55 11,12402 11660 15 14840 4569 16182 Double ,0 12402 \- areas 212 12312 collected 14840 114 18656 108 9324 v 15 912 95376 sum. 72 114 87186 522 12312 69 696 37 87 106 16182 176 636742106 18656 Part IV,) LAND-SURVEYING. 661056^68543 ( Whole50154 ^ double areas05376 j collected- 2)875129 1750256 40 Area 4a. 1r. 20e. 117 COMPUTATION OF THE AREA BY REDUCING THE CROOKED SIDESTO STRAIGHT ONE
A complete treatise on practical land-surveying, in seven parts; . Double areas collected. 50154 sum. Offsets taken on the line C A, 232 72 252 55 45 37 1060 117 1764 LC 106 756 11660 7 2 9324 55 11,12402 11660 15 14840 4569 16182 Double ,0 12402 \- areas 212 12312 collected 14840 114 18656 108 9324 v 15 912 95376 sum. 72 114 87186 522 12312 69 696 37 87 106 16182 176 636742106 18656 Part IV,) LAND-SURVEYING. 661056^68543 ( Whole50154 ^ double areas05376 j collected- 2)875129 1750256 40 Area 4a. 1r. 20e. 117 COMPUTATION OF THE AREA BY REDUCING THE CROOKED SIDESTO STRAIGHT ONES : GENERALLY CALLED CASTING. JB. Having constructed the figure as before, and taken out thechain-lines; draw the three dotted lines A B, B C, and C A,in such a manner, that the parts included may be equal to thoseexcluded, as nearly as your eye can judge. Then the base A Obeing measured, will be found = 1390 links; and the perpen-dicular B a = 630 links. 1390 per. 417008340 E 2)875700 4 Area 4a. Ir. 20p. i 3 118 LAND-SURVEYING. (Part IV. Note.—Although the method of finding the area by Casting (which de-pends entirely upon the accuracy of the eye) is adopted by most PracticalSurveyors ; it is certainly less correct than that by Offsets, &c. A learner,therefore, ought to practice both, until he can habitually come very nearto the truth by the former. 3. Lay dov\Ti a field, and find its area, from the followingnotes. BD 760 Return to DA 1035 R. offD. CD 61 1145 55 1100 12 1000 72 950 119 900 80 850 61 800 59 750 110 700 179 600 210 550 215 500 212 450 180 400 159 350 142 300 16
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