The Plane-table and Its Use in Topographical Surveying: From the Papers of the United States Coast SurveyVan Nostrand, 1869 - 79 Seiten |
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4.)-When the point accuracy adjustment alidade angle of elevation axis beginner brass centre chain chain-man circle clamp Cloth Coast Survey construction contours correct cross-hairs curves declinatoire delineation depression determined direction distance edition Engineers engraved experiments Feet fiducial edge field forward line forward signal ground hachures heights hills horizontal Hypsometry Illustrated inked instrument intersection J. P. WHITNEY letters line of sight lines drawn low water marked means measured ment meridian Merrimack River method metres middle point minutes of arc necessary objects observed operations paper parallel pencils perpendicular placed plane plane-table Plate plotted points point occupied point sought falls practical projection purpose resection right angles rule scale sheet shore line side sketching slope square miles station straight-edge Strength of Materials taken tangent screw telemeter telescope tion topographer triangle of error triangulation points true point true position U. S. Navy vertical arc
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