A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 181
e AC, CB, and ACB to findABC. Run CF, making BCF = B - F, or 180° - (B +F), andit will make the required angle with AB. 298. If the point be inaccessible.From any convenient stations Aand B (Fig. 121) in the line AB,take the angles of position of thepoint C, and measure AB. Then,in the triangle… … BD. For we have sin. ACB : sin. BAC :: AB : BC,and sin. BDC : sin. BCD :: BC : BD. Whence (23.6)sin. ACB . sin. BDC : sin. BAC . sin. BCD :: AB BD. Having found BD, DC may be run towards C; or by theangle, if C be invisible from D. If C is visible from the point D, the latter may be foundby trial,…
Surveying
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