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Features of Surveying Instruments
SPECIAL HYDROGRAPHIC SURVEYS
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adjustment alidade approximately azimuth base line bearing bench marks boundaries bubble center line chain circle clinometer compass computed contour lines coordinates corner correction cross-hair cross-section curve described in Art determined difference in elevation direction dumpy level earthwork employed ephemeris error of closure established example eyepiece field foresight distances given grade graduated ground points head chainman highway horizontal angle horizontal distance hour angle instrument intersection invar land latitude level tube line of sight logarithm means measured meridian method miles notes objects observed offset parallel perpendicular plane table planimeter plotted plumb Polaris precision probable error problem procedure protractor refraction rod reading scale screws shown side slide rule stadia stadia interval standard surface survey surveyor systematic errors taken tangent tape length telescope theodolite tion topographic triangle turning points usually vernier vertical angle vertical axis