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ti <br />CURVE TABLES <br />0;Published by KEUFFE! & ESSER CO. <br />3 6 t I HOW TO USE CURVE TABLES - <br />�`i'� Table I. contains Tangents and Externals to a 1° curve. Tan. and <br />,xt. to any.othd radius maybe found nearly enough, by dividing the Tan. <br />:x Ext. opposite the given Central tingle by, the given degree of curve. <br />-� '•To find-,Deg.' of-Curve, having- •the _Central Angle and Tangent: <br />Divide Tan.- bpposite the given Central Angle by the given Tangent. <br />To, find: Deg.,: of Curve;:havi-ig `the' Central •Angle,' and -External: . <br />Divide Ext. opposite the given'Central Angle by the given External. <br />,Jt To find Nat. Tan:: a td.Nat. Ex:.Sec.!for any angle by Table I.- Tan. <br />�r Ext. oftwtee the given angle dtvtded by the radius of a 1 curve will ' <br />a ,e the Nat Tan. or-`Nat: Ex Sec <br />EXAMPLE C <br />Wanted a Curve with an Ext. of about 12 ft'. Angle; <br />r. of l itersectioii or [: 'P.=23° 20' to'the R.:at Station <br />© . - j b42+,72? <br />1 J . �- �',1 �� _ . - i iEXt. in Tab: I- opposite 23 <br />�° 20' 0 120.87 <br />120.87-x-12=,10.07. _Say a 10 Curve , <br />a Tan.-in Tab..d'opp.23° 20'=11831 <br />-------- 1183.1 j 10 118 31: <br />9.Correction, for A: <br />