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I CURVE - TABLES. Published by, KEUF, FEL & ESSER CO. HOW TO • USE ,.CURVETABLES. Table I. contains Tangents and Externals to -a P curve. - Tan. and Ext. to Any other radius maybe found nearly enough, by dividing theT,an. or Ext, opposite the given Central Angle by the given degree of cur Oe. :'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 Ankle by th'6 given External. y angle by Table I.: Tan. To find Nat. Tan. and Nat. Ex. See. for an or Ext. of twice the given angle'divided bythe any, of a -I* curve will be the Nat. Tan. or Nat. Ex, See. EXAMPM - Wanted a Curve with an Ext. of about 12 ft. Angle of,, ntersection or I. -P.=230 20' to the R. at' Station 542+72. Ext. in Tab. I opposite 23°•20f = 120.87 120.87 7142 =10.07.. Say ;i 10° Curve. Tan. in Tab. I'opp. 23? 20'= 1183.1 1183.1-10=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 10'= 2.3333 L., C., 2* 1921'=def. for sta.".: 542 1. P. = sta. 542+72 404911—, a a a 2 +50, Tan. = 1 .18.47 70 19;'= u u u 543 90 49j'a +50 B. C. = sta. 54i }53.53 = 110 40'�' u 11 543+ L. C.— 2 .33.33 8636 , E. C. Sta. 543+86.86 100-:-53.53 =46.47XX(def. for I ft. of. 10° Cur.) 139.41'= 2`19i' = def.' for sta.- 542. Def. for -50 ft. --2* 30'for-a-10* Curve. - Def. for 36.86 ft. P 50j' for a 10° Curve. 7, �F ;7 ®r 4- ,_3 6, 313-d T: 3 70 CURVE - TABLES. Published by, KEUF, FEL & ESSER CO. HOW TO • USE ,.CURVETABLES. Table I. contains Tangents and Externals to -a P curve. - Tan. and Ext. to Any other radius maybe found nearly enough, by dividing theT,an. or Ext, opposite the given Central Angle by the given degree of cur Oe. :'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 Ankle by th'6 given External. y angle by Table I.: Tan. To find Nat. Tan. and Nat. Ex. See. for an or Ext. of twice the given angle'divided bythe any, of a -I* curve will be the Nat. Tan. or Nat. Ex, See. EXAMPM - Wanted a Curve with an Ext. of about 12 ft. Angle of,, ntersection or I. -P.=230 20' to the R. at' Station 542+72. Ext. in Tab. I opposite 23°•20f = 120.87 120.87 7142 =10.07.. Say ;i 10° Curve. Tan. in Tab. I'opp. 23? 20'= 1183.1 1183.1-10=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 10'= 2.3333 L., C., 2* 1921'=def. for sta.".: 542 1. P. = sta. 542+72 404911—, a a a 2 +50, Tan. = 1 .18.47 70 19;'= u u u 543 90 49j'a +50 B. C. = sta. 54i }53.53 = 110 40'�' u 11 543+ L. C.— 2 .33.33 8636 , E. C. Sta. 543+86.86 100-:-53.53 =46.47XX(def. for I ft. of. 10° Cur.) 139.41'= 2`19i' = def.' for sta.- 542. Def. for -50 ft. --2* 30'for-a-10* Curve. - Def. for 36.86 ft. P 50j' for a 10° Curve.