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Air RETURN TU <br /> DIETZGENT Mt "MVCURVE <br /> AND <br /> REDUCTION TABLES <br /> Cbmisbt',1914,by Eugene Dietzgen Co.,New York C3 T <br /> -_ PG T <br /> N pr <br /> °1 <br /> __ ) `a - 2. <br /> CURVE FORMULAS <br /> Radius=R=sin60 (1) Degree of Curve=D and sin.,D= a(2) <br /> Tangent=T=Rtan� (3)Length of Curve=L=100 (4) <br /> Middle ordinate=M= R(1—cos. Ay)(5) =Rvers 1(6) <br /> ' External=E=Ttan k(7)=R+cos.4-R(&)=Rexsec 0) <br /> - Long Chord=C=2 R z (10)o=Central Angle <br /> ----- . EXPLANARON AND USE OF TABLES <br /> Stations.---Given P..I. <br />