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✓ <br /> t - - -- - - - - CURVE TABLES. <br /> Published by KEUFFEL & MMR CO. <br /> FE <br /> LD B O Q ,� HOW TO USE CURVE TABLES. <br /> y g Y ug, , Y g <br /> Table I. contains Tan ents.and Externals to a 1 curve. Tan.and <br /> Ext.toan otherradiusmaybefoundnearl ono h b dividm theTan. <br /> or Ext.opposite the given Centras Aa le by the gtvon degree of curve. <br /> To find Deg.�0 Curve, having t Cgentrah Angle and Tangents <br /> Divide Tan.opposite the given Central <br /> le by the given TangenL <br /> — - - ---- - --------- -- - `.. dd DegoCurve, having Ceutrid and <br /> :Die E to entr e by 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 P curve will <br /> her the Nat.Tan.or Nat.Ex.See.' 4 <br /> -- - - -- --- Wanted a Curve with an Ext.of about 12 ft. Angle <br /> of Intersection or I. P.=23" 20',to the R. at Station <br /> t 542+72. <br /> f Ext.in Tab. I opposite 23°20•=120.87 <br /> 120.87-:-12=10.07. Say a 10"Curve. <br /> Tan.in Tab. I opp.23°20'-1183.1 <br /> 1183.1- 10=118.31. <br /> Correction for A.23°20'for a Hr Cur. 0.16 <br /> - t 118.31+0.16=118.47-corrected Tangent. <br /> (If corrected EV,is required find in same way) <br /> ---- -. _- _ - Ang.23°20'=23.33*:10=2.3333-L.C. <br /> 2°19Y-def.for sta. 542 1. P.=sta. 542+72 <br /> 4°49j'= a a a +50 Tan.= 1 .18.47 <br /> I 7019j'= a a a b43 B <br /> 9°49+}'= +50 a a a C.=sta. 641+53.53 <br /> 4o, a a a + L.C.= 2 .33.33 <br /> - -- --- - -- -- - - 1 Z 11 a 543 <br /> 86.86 1 E.C.=Sta. 543+86.86 <br /> 100-53.53-46 47x3'(def.for I ft.of 10°Cur.)=139.41'= <br /> To �,o o• /i Za' 20 191'-def.for sta.542. <br /> - - -- ----- — - -- ---- Def.for 50 ft.=2°30'for a 10°Curve. <br /> Def.for 36.86 ft.=10 50+}'for a 10°Curve. <br /> LuI <br /> dP <br /> J /� L 3• -rd ' � \ e�� � <br /> f-•� �,�7 �� 10•Curve <br /> \ •• • a ' . . 'r . <br />