Laserfiche WebLink
ZY <br />` CURVE TABLES <br />S'Y s'- — o Published by NEUFFEL & ESSER CO. <br />HOW TO USE CURVE TABLES <br />7- 2. Table I. contains Tangents and Externals to a I' curve. Tan. and <br />_ Ext. to any other radius may be found nearly enough, by dividing the Tan. <br />1 or Ext. opposite the given Central Angle by the given degree of r:urve. <br />p y Z Q To find Deg, of Curve, having the Central Angle and Tangent: <br />l Divide Tan: opposite the given Central Angle by the given Tangent. <br />To find De of Curve, having the Central Angle and External: <br />s <br />�` 3 - 10 Divide Ext. opposite the given Central Angle by the given External. <br />To find Nat. Tan. and Nat.Ex. See. for any angle by Table I.: Tan. <br />� or Ext. of twice the given angle,divided by the radius of a V curve will <br />be the Nat. Tan. or Nat. Ex. Sec. <br />EXAMPLE <br />i 4 „ Wanted a Curve with an Ext. of about 12 ft. Angle <br />of Intersection or I. P.=230 20' to the R. at Station <br />E 542-72. <br />1 c'_ l:xt. in Tab. I opposite 23° 20'=120.87 <br />1 120.87-12=10.07. Say a 10° Curve. <br />Tan. in Tab. I opp. 23" 20'= 1183.1 . <br />11$3.1: 10 =118.31. <br />Correction for A. 23° 20' for a 10° Cur. =0.16 <br />f 11.8.3L+0.16-118.47—corrected Tangent. <br />(if corrected Ext. is required' find in saine viay) <br />Ang.23°20'=23.33 -10=2.3333=L. d. <br />2° 191'= def. for sta. 542 1. P. =sta. 542-72 <br />4° 492•= " x-50 Tan..= 1 .18.47 <br />7° 192'= " 543 B. C.=sta. 541+53.53 <br />9. 492,= " " « +50 <br />11° 40'= " 513+ L. C. 2 .33.33 <br />86.86 E. C. = Sta. 543 +86.86 <br />100--53.53=46.47X3'(def. for 1 ft. of 10° Cur.) <br />2° 192'Tdef. forsta_ 542. <br />Def. for 50 ft. =2° 30' for a 10' Curve. <br />Def. for 36.86 it. =1a 50#' for a 10° Curve. <br />0 <br />