Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 34
es by the telescope level, as this is much more sensitivethan the levels on the plate. • In this operation the positionof the level on the telescope must be observed over both setsof leveling screws, one half the correction being made by theaxis tangent screw, the other half by the leveling… … Fig. 14. The Surveyors Transit 26 SURVEYING until the object to be observed appears well defined. Thislatter process must be repeated when the distance to theobject is changed. Measurement of Horizontal Angles. Place the instrumentdirectly over the vertex of the angle, and level. Set thelimb at…
Surveying
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