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accuracy adjusted axis azimuth backsight and foresight bubble calculator centerline clockwise computed coordinates of point correction cross hairs cross section cumulative curve deflection angles determined difference in elevation differential leveling direction drainage CL dumpy level elevation difference elevation of BM equation Example foresight distances foresight reading Geodetic grade height horizontal distance inHg instrument intersection known latitudes and departures law of cosines law of sines leveling screws line of sight magnetic magnetic bearings measured distance method modulation National Geodetic Survey observer obtained optical perpendicular plumb bob position precision property corner radians rear taper reflector result right-of-way rod reading shown in Fig side significant figures slope angle slope distance Solution Solve stadia standard error steel tape Substituting into Eq surveying surveyors tangent tape length taping pin telescope tension theodolite tilt transit traverse triangle vernier vernier scale vertical angle wavelength zero