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CURVE TABLES <br />Published by KEUFFE <br />� L & ESSER CO. <br />HOW TO USE CURVE TABLES <br />Table I. contains <br />Ext. to.any other radius may Tangents and Externals to a 1° curve. <br />or Ext: opPosite the iven y e found nearly enou h, b Tan• and <br />To find De g Central Angle by the given deg eeloftclu Te.1 <br />Divide Tan. g' °f Curve, having the Central Angle and <br />To find Deg. ite the given Central Angle b <br />8• of Curve Tangent: <br />Divide Ext. ° , having the CentraltAng1en tangent. <br />To find at. Tae the given Central Angle by the given External. le and al: <br />r Ext: of twice ttheani end Nat. Ex. Sec. for any angle b <br />e the Nat. Tan he g angle divided by the radius of a 1 bcur** wljj <br />Nat. Ex. see. <br />j EXAMPLE <br />i 542 �7anted a Curve WithanExt. o but 12 ft. Angle <br />of Intersection or 1. P.-230 <br />R. at Station <br />Ext. in Tab. 17 ° <br />120.87 = pPosite 23 20' =120.87 <br />12=10.07. Say a 10° Curve, <br />Tan. in Tab. I ° <br />1183.1 °PP• 23 201-1183.1 <br />t - Correction for A 10-118'31. <br />118.31+0.16=1'18-47= 0 for a l0° Cur. =0.16 <br />' <br />corrected Tangent. <br />(If corrected corrected <br />required <br />e fired find in same way) <br />2°19i'_Ang'23°20'= 10=2.3333= <br />a —def. forsta. 542 I. <br />—L. C. <br />4° 49f'= a u a I'. =sta. 542+72 <br />70 19z'= ° a a +50 Tan. = _ 1 .18.47 <br />9° 49,1' _ « 543 B. C. <br />11*401— +50 sta. 541-x-53.53 <br />_ 2 .33.33 <br />86.86 F.,. <br />100-53..53=46.47X3'(def. for 1 ft of to 543+86.86 <br />2° 19F—def. for sta. 542, <br />Der. <br />Def. for 50 ft. =2° 30' fora 10° Curve, <br />Def. for 36.86 ft. =1° 50,' fora 10 <br />e ° Curve. <br />• <br />ex>� <br />-- I.ea„ g.z3 •zw <br />- - --- - - — -- v Io•CW^p <br />\s <br />\k <br />K <br />X445 <br />M <br />