Popplewell, William Charles, 1865- · London, New York [etc.] Longmans, Green and co. · leaf 79
table in the same position and the straight-edge pressed against the needle at x, the line of sight is directedsuccessively towards A, B, C, D, and E, and lines drawn along the edgeof the alidade when in these positions. This operation will constitutea graphical record of the respective angles YXA,… … FIG. 56.—Plane table—Intersection. be placed directly over Y on the ground. It is also necessary thatwhen the alidade is placed along xy, the observer on looking through
Surveying · Geodesy
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