Laserfiche WebLink
- _r CURVE TABLES. <br /> Published by KEUFFEL & ESSER CO. <br /> __ HOW TO USE CURVE TABLES. <br /> _ - - . - <br /> o cc Vii' �i L Table I. contains Tangents and Externals to a V curve. Tan.and <br /> / / -- ---- Ext.to any other radius msy be found nearly enough,by dividing theTan. <br /> or Eat.opposite the given Central Angle by the given degree of curve. <br /> - - - To find Deg. of Curve, having the Centrar Angle and Tangent: <br /> Divide Tan.opposite the given Central Angle by the given Tangent. <br /> To find Deg. of Curve, having the Central Angle and External: <br /> / - --- - Divide Ext. opposite the given Central Angle by the given External. <br /> } ___ _ _- ✓,.y � ' To find Nat.Tan.and Nat.Ex.Sec.for any angle by Table I.:Tan. <br /> or Eat.of twice the given angle divided by the radius of a V curve will <br /> 1 _/ LL - be the Nat.Tan.or Nat.Ex.Sec. <br /> -- — r_ - EXAMPLE. <br /> r <br /> 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 /> -_ 542+72. <br /> Ext.in Tab. I opposite 230 20-=120.87 <br /> --- - -_ -_-_ ._-- 120.87+12=10.07. Say a 100 Curve. <br /> Tan.in Tab. I opp.23°20'=1183.1 <br /> --- - --- 1183.1+10=118.31. <br /> Correction for A.230 20'for a 100 Cur.=0.16 <br /> - - 118.31+0.16=118.47=corrected Tangent. <br /> --- ----- (If corrected Ext.is required find in same way) <br /> - - Ang.23°20'=23.33 +10=2.3333=L.C. <br /> — ------ 2°19Y=def.for sta. 542 I. P.=sta. 542+72 <br /> 40 49j'= " " " +50 Tan.= 1 .18.47 <br /> 70 191'= " 543 <br /> -- --- - <br /> 9°491'= ,}r� <br /> B.C.=sta. 541+53.53 <br /> _ a a a <br /> 110 40'= a « a 543+ 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 100 Cur.) -139.41'= <br /> 2°19F=def.for sta.542. <br /> - - -" - Def.for 50 ft.=20 30'for a 10°Curve. <br /> ------ Def.for 36.86 ft.=10 501'fora 100 Curve. <br /> d* <br /> Px <br /> I <br /> 10•Curve <br /> \ <br /> Oit <br /> 4FIEL17 Boo <br /> `a� / <br /> SIN <br /> .e , <br />