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, &cIllustrated by four hundred engravings, and a magnetic chart . he longer one is preferable) bj the smiiof the two perpendiculars, and divide the product by two. Otherwise: reduce the four-sided figure to one triangle as inArt. (78) ; or, use any of the methods of the preceding chapter. Example 3. In the field drawn in Fig. 50, on a scale of 3 chainatc the inch, AB = 588 Hnks, BC = 210, CD = 430, DA = 2
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, &cIllustrated by four hundred engravings, and a magnetic chart . he longer one is preferable) bj the smiiof the two perpendiculars, and divide the product by two. Otherwise: reduce the four-sided figure to one triangle as inArt. (78) ; or, use any of the methods of the preceding chapter. Example 3. In the field drawn in Fig. 50, on a scale of 3 chainatc the inch, AB = 588 Hnks, BC = 210, CD = 430, DA = 274,the diagonal AC = 626, and the proof diagonal BD = 500. Thetotal content will be lA. OR. 17P. JEx. 4. The sides of a four-sided field are AB = , BC= , CD = , DA = ; the diagonal BD = ,and the proof line AC = Required the content. Ans. 4A. 2R. 38P. Ux. 5. The sides of a four-sided field are as follows : AB =, BC == , CD = , DA = ; the diagonal fromA to C is ; the proof diagonal from B to D is Re-quired the content. Ans. Mx. 6. In a four-sided field, AB = , BC = , CD =, DA = , AC = , BD = Required thecontent. Ans. (92) A many-sided field, as Fig. 51. Fig. cnxp. SurYeyins by Diagonals. 61 FieldrWbrk. Measure all the sides of the field. Measurealso diagonals enough the field into tnangles ; of whichthere Avill ahvajs be two less than the number of sides. ChooseBuch diagonals as will divide the field into triangles as nearly equi-lateral as possible. Measure also one or more diagonals for Proof lines. It is well for the surveyor himself to place stakesin advance at all the comers of the field, as he can then select thebest mode of division. Platting. Begin with any diagonal and plat one triangle, as inArt. (90). Plat a second triangle adjoining the first one, as inAi-t. (91). Plat anotker adjacent triangle, and so proceed, tiU allhave been laid down in their proper places
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectsurveying, bookyear18
