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