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CUM: TA ni c ' . Published by KEUFFEi 8. ESSER Co. Now r® USE CURVE TABLES Table I. contains Tangents and Externals to a 1° curve. Tan and Ext. xExt-any other radius may be found nearlyenough, by dividing the Tan. APOsite the given Central Angle by the given degree of curve. To find Deg. of Curve, having the Central Angle and Tangent: Divide Tan. opposite the given Central Angle by the given Tangent. To find Deg. of Curve, having the Central Angle and External: Divide Ext. opposite the given Central Angle by the given External To find Nat. Tan. and Nat. Ex. Sec. for any angle by Table I.: Tan. or Ext. of twice the given angle divided by the radius of a 1° curve will be the Nat. Tan. or Nat, Ex. See. EXAMPLE of Intersect n orrvwith at, Ext. 1e P. =230 20' to the about R.1 at fr. Stat,oln 542+72. Ext. in Tab. I opposite 230 20' =120.37 j 120.87 =12 - 10.07. Say a 10° Curve, Tan, in Tab. I Opp, 23° 20'=1183.1 •1183.1y10=118.31. Correction for A. 23' 20' for a 10° Cur, =0.16 118.31-}-0.16 =118.47 =corrected Tangent. (If_corrected Ext* is required find in same way) Ang. 23° 20'=23.33*-s0=2.3333=L. C. 20 1921'= clef. for sta, 542< I, T'. =sta." 542 i 72 4° 4911= ,� « 7' 192' = u a . 5 1 . 18.47 1'an. = 543 B. C. 90 4921— u u +50 541+53.53 11'401= v u 543+ L C = 2 .33.33 1Qa-53..53 46.47 X'W(de6 for ft. f 10, Cu'.)139.41 6 86 2° 19;' = def. for sta, 542, Det, for 50 ft. =2° 30' for a 10' Curve. Def, for 36.86 ft. =1' 50}' for a 10° Curve. � r Ik r r i f i i j CUM: TA ni c ' . Published by KEUFFEi 8. ESSER Co. Now r® USE CURVE TABLES Table I. contains Tangents and Externals to a 1° curve. Tan and Ext. xExt-any other radius may be found nearlyenough, by dividing the Tan. APOsite the given Central Angle by the given degree of curve. To find Deg. of Curve, having the Central Angle and Tangent: Divide Tan. opposite the given Central Angle by the given Tangent. To find Deg. of Curve, having the Central Angle and External: Divide Ext. opposite the given Central Angle by the given External To find Nat. Tan. and Nat. Ex. Sec. for any angle by Table I.: Tan. or Ext. of twice the given angle divided by the radius of a 1° curve will be the Nat. Tan. or Nat, Ex. See. EXAMPLE of Intersect n orrvwith at, Ext. 1e P. =230 20' to the about R.1 at fr. Stat,oln 542+72. Ext. in Tab. I opposite 230 20' =120.37 j 120.87 =12 - 10.07. Say a 10° Curve, Tan, in Tab. I Opp, 23° 20'=1183.1 •1183.1y10=118.31. Correction for A. 23' 20' for a 10° Cur, =0.16 118.31-}-0.16 =118.47 =corrected Tangent. (If_corrected Ext* is required find in same way) Ang. 23° 20'=23.33*-s0=2.3333=L. C. 20 1921'= clef. for sta, 542< I, T'. =sta." 542 i 72 4° 4911= ,� « 7' 192' = u a . 5 1 . 18.47 1'an. = 543 B. C. 90 4921— u u +50 541+53.53 11'401= v u 543+ L C = 2 .33.33 1Qa-53..53 46.47 X'W(de6 for ft. f 10, Cu'.)139.41 6 86 2° 19;' = def. for sta, 542, Det, for 50 ft. =2° 30' for a 10' Curve. Def, for 36.86 ft. =1' 50}' for a 10° Curve.