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DILMEWS RAILROAI? i <br /> AND <br /> REtRJCTION TABM <br /> C*Vri&t,2914,by Euseni D4+tepa C6,.NiwYoek OW <br /> � FIELPBOK - U � ... T <br /> � <br /> I <br /> �`hkn � I ✓ , CURVE FORMULAS <br /> I <br /> PjAus=R= (i)Degree of G�tve=D and sin.Ds x(9h <br /> o Tangent=T$$tan$(3)Length of Curve=L=100$(4) <br /> f12 /4,3 Middle ordinate=M"=R(1—cos. r)'(5)=Rvers'(6) <br /> Fxters41=E=Ttan;-(7)=R+cos-4-R(8)-Rexsec-f(9) <br /> s _ <br /> 77J s Long Chord=C=2 R sin.i(10)a=Central Angle <br /> ;. E XPtANATION AcND USE OF TABLES <br /> stalk".—Oven P. 1.—Sta. 161+60.35 to find Sta. of P. C. <br /> r'72 <br /> G ./ .- sad P.T. n = <br /> 62° 10' DS°29'.From Table IV for P curve'T'= <br /> E _ 8454,1 aad+8)§*t--414.49!t. Prom Table V oorrection--.36 or T <br /> 414.88 MP. C. P.I 7'-157 4-45.50. Also from (4) Lm-- <br /> 746.00 and P.T.-w*ta.P.C.+L-p164+4L50. <br /> Odwto--lanjent 6& to vary (apgroximately) directlyi�{ith <br /> D said � square of the distante. Thus tangent offset or Ca. <br /> 168 do De it.found as follow& •P'ronr Table III tangept; <br /> ofiml�et �2t10 <br /> ft. 7.27 ft. Dietanoe?-158 <br /> p+4 -�8ta.I'. G .bO hem <br /> olf9e .' (54.50+100 .18 ft. Also square of any detaooe <br /> t-5`/ f Z,b' �r96ge tho radiusuala2(aapp�ppro2ainately)the diatiauee iron <br /> Cant °ot�ro e� Thus (54 +(Z x 688.26)=2.18 it. <br /> I <br /> . b bon angle-34 D for 100 ft., D for 50 ft., <br /> it.� tdan ).3 2:O*Ilf°or +deb for I/ <br /> h..front Table <br /> f t rl/'y-8 I z¢ _ 0 f poi tx. `: abG a othv�3 x 54.5 x 8}ya136A' or <br /> 36,2'h orA.Table III. For€eta. 159 deflec- <br /> +2-0 ,etc. .` 1 <br /> ' bs fun , e lar ma <br /> d anet to tangents��, Thus' <br /> Fo��rom Table IV for P curve� 0.6 j <br /> i 27 <br /> from Table V oorrectio .10 or <br /> 18�f ii t?1f e11�dp=3 d R is eseaeured mind found to be <br /> 30'. What-ia TyY.. Fee ront Table lV E 30.9 and+42-55Z or D-m.. <br /> • <br /> r r <br /> IN ♦ , <br />