Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 222
to plot c, representing C onthe ground. 1. By intersection. Place the table in position at A (Fig. 36), plumbing a over A, andc making the fiducial edge of the ruler pass through a; turn thealidade about a until the line ofsight bisects the signal at C, anddraw a line along the fiducial edgeof the… … THE PLANE-TABLE. PLANE-TABLE SUEVEYING. 51 2. By resection. Place the table in position at A (Fig. 37), and draw a line in the di-rection of C, as in the former case; then remove the instrument to C,place it in position by the line drawn Xc / ■^ / .. b ^a nB Fig. 37. from a, make the edge of the…
Trigonometry · Surveying · Navigation
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