A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 108
l to theline of collimation. Verification. Select a piece of level ground, and drivetwo stakes, A and B, (Fig. 68,) four or &ve chains apart.At C, equidistant from them, set the instrument. Levelthe plates, and bring the bubble in the telescope level, tothe middle of its run; then let an… … to the same spot on the staff. The tops of A and B arethen level, whether the instrument is in adjustment or not. 106 PLANE TRIGONOMETRY. [Chap. III. !Now remove the instrument to G, and level as before.Direct the telescope to the staff on B, and note the pointI of intersection. Let the assistant…
Surveying
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