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9 Prop adjustment approximately axis barometric borrow pit canals cd L Ctn cd LTan center line center of gravity center stake Chord Definition circular curve Cm Cm Column computed construction contractor cost cross-hair cross-section cubic parabola cubic yards cut or fill deflection angles degree of curve desirable distance earth elevation end areas Ephemeris errors estimate example Exsec feet field notes final location foot formula free haul frog ground highways horizontal inches L8in LCos LCtn Logarithms of Trigonometric LSin mass diagram material measured method necessary offsets ordinate osculating circle overhaul parabola pile Polaris precise preliminary prismoidal correction Radius read as printed read co-function reverse curve rock route sections slope stake speed spiral station steam hammers superelevation survey switch rails Table tangent tape tion track transit traverse Triangular Prism Trigonometric Functions turnout usually utes Length Values of Trigonometric Vers vertical curve yardage