Laserfiche WebLink
FIE D BO K 51 . <br /> -- CURVE TABLES. <br /> `• '"" Published by KEUFFEL & ESSER CO. <br /> HOW TO USE CURVE TABLES. <br /> Table I. contains Tangents and Externals to a 1°curve. Tan.and <br /> -- t�' -- - ------__ Ext.to any other radius may bo <br /> found nearly enough,by dividing theTan. <br /> or Ext.opposite the given Central Angle by the given degree of curve. <br /> ---- --- — To find Deg. of Curve, having the Central Angle and Tangent: <br /> y� �, Divide Tan.opposite the given Central Angle by the given Tangent. <br /> — --- _ ?hi r To find Deg. of Curve, having the Central Angle and External: <br /> - - Divide Ext.opposite the given Central Angle by the given External. <br /> —_ 0_Y' 91 4, W 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 1°curve will <br /> be the Nat.Tan.or Nat.Ex.Sec. <br /> - __ -- - <br /> EXAMPLE. <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 23°20'=120.87 <br /> --- - - - -g �l 3-� '� 120.87-1-12=10iO7. Say a 10°Curve. <br /> Tan.in Tab. I opp.23°20'=1183.1 <br /> - - 1183.1=10=118.31. <br /> -------__-- _ _ 9e u o Correction for A.23°20'for a 10°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°191'=def.for sta. 542 I. P.=sta. 542+72 <br /> 4°49}'_ " +50 Tan.= 1 .18.47 <br /> _ 7°19j'= a a u 543 <br /> -- _ B.C.=sta. 541+53.53 <br /> 9'4911= a u u +50 <br /> fj" 11°40'= a u 543 <br /> + L. C.= 2 .33.33 <br /> a <br /> 9, - 86.86 E.C.=Sta. 543+86.86 <br /> _..__ ��i <br /> 100-53.53=46.47X31(def.for 1 ft.of 10°Cur.)=139.41'= <br /> w4 t Y 1�v, 2 7 O s 1r 2°191'=def.for sta.542. <br /> - Def.for 50 ft.=2°30'for a 10°Curve. <br /> ---- 70�. L/� i f ttB,•, , /,�� p e f Def.for 36.86 ft.=1°50#'for a 10°Curve. <br /> / L <br /> Cl CGT jir <br /> -- c/ �. z G �8.7 l <br /> x>A <br /> -- - - I.P.A"9.23°201 <br /> y<..� r 211' S•q D ✓ -•u <br /> `\ep � <br /> to*curve <br /> Of <br /> %, <br /> a °w goo, <br /> s <br /> 1 • <br /> a <br />