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Observations of Different Reliability
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adjustment aerial alidade altitude angular axis azimuth backsight base line bearing bench marks boundaries Chap clinometer Co-tan compass computed contour interval contour lines coordinates corner correction Cotang cross hair cross-sections curve described in Art determined difference in elevation direction dumpy level earthwork employed ephemeris error of closure established field figure given grade ground points head chainman highway horizontal distance instrument intersection land latitudes and departures length line of sight longitude magnetic bearings means measured meridian method miles monuments objects observed offsets parallax perpendicular photographs plane table plane-table plotted Polaris precision principal meridian probable error problem procedure protractor rod reading route scale screws sheet side slope stadia interval stakes subdivision surface surveyor surveys Table VIII—Continued taken Tang tangent tape telescope tion topographic map township tract transit station traverse line triangle U.S. Geological Survey usually values vernier vertical angle