A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 190
thelines, their intersec-tion E being both in-visible and inaccessi-ble. It is required torun a line from agiven point G, thatshall pass through E,and to determine GE. Run any base lineGH, and take the angles of position of the points A, B, C,and D on the given lines. Find GC, GD, and GDC; also GA,… … If the lines AB and CD were accessible, the line GE might be run by Art. 212, and the distance determined by taking the angles C and G, (Fig. 139.) sin. GCE ^Then GE = ——- - GC.sin. GEC Fig. 139.
Surveying
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