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CURVE TABLES. - -� <br /> ' Published by KEUFFEL ESSER CO. <br /> HOW TO USE CURVE TABLES. <br /> > Table I. contains Tangents and Externals to a 10 curve. Tan.and <br /> Ext.to any other radius may be found nearly enough,by dividing the Tan. <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 /> �1�y t, 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 /> To find Nat.Tan.and Nat.Ex.Sec.for any angle by Table I.:Tan. <br /> - - "' - - -- or Ext.of twice the given angle divided by the radius of a 1°curve will <br /> be the Nat.Tan.or Nat.ESec. <br /> x.EXAMPLE. <br /> - r _ 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-x-72. <br /> ri Ext.in Tab. I opposite 23°20'=120.87 'S¢' <br /> ---- -- _ _ 120.87=12=10.07. Say 10°Curve. Y' <br /> Tan.in Tab. I oPP.23°20'=1183.1 4 /' 66 <br /> ' <br /> - - --- 1183.1=10=118.31. <br /> a 7-Z t -- <br /> o r `' T Correction for A.23°20'for a 10°Cur.=0.16 <br /> }L D 7 n- - J -- - -- 118.31- 0.16=118.47=corrected Tangent. <br /> __ _ (If corrected Ext.is required find in same way) <br /> Z/ 3v D, -- Ang.23°20'=23.33°=10=2.3333=L. C. <br /> 2°192'=def.forsta. 542 I. P.=sta. 542+72 <br /> 40492'P= a ra 4a <br /> 7 192 X50 Tan.= 1 .18.47 <br /> ° '= « 543 <br /> « " <br /> --- - / f --- -- - B.C.=sta. 541 53.53 <br /> - 3 11 f 50 S <br /> ---�. r - --- �? - - 11°40'= 11 « u 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 10°Cur.)=139.41'= <br /> --- <br /> x 2°192'=def.for sta.542. /Z <br /> Def.for 50 ft.=2°30'for a 10°Curve. q 5C <br /> - ' Def.for 36.86 ft.=1°50}'for a 10°Curve. <br /> • 1� G-.,?�. i- I t I.P.Ans.23.201 <br /> C' a*> d eL <br /> N <br /> 10*Cur" <br /> -- <br /> \ xi <br /> * . <br /> 10 <br /> r <br />