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I ' _ <br /> DILTZGEN'S RAILROAD CURVE.-- <br /> AND <br /> URVE- <br /> AND <br /> iy17 , REDUCTION TABLES <br /> e."4 7 -2e'i i'1 L G' = 0 �/.5 CbmdaUt.4914,by Eumn Dietsom Co»New York City <br /> i= <br /> �+ I / Q� C, y�j _` • Radius=R= <br /> Mj <br /> je <br /> FORM <br /> UIAS <br /> (1 <br /> ` <br /> of Curve=D and sin.D=&,(2) <br /> �o� 1)I _i 7 ! l/t' Tangent=T=Rtan"' (3)Length of Curve=L=1062(4)R.' <br /> =10 D(4) <br /> Middle ordinate=M=11(1-cos. 6ey)(5) =Rvers$(8) <br /> F.iternal=33=Ttan.4-(7) <br /> Long Chord=C=2 R sin.a(10),&_Central Angle <br /> EXPLANATION AND USE OF TABLES <br /> i ( gt s.--liven P. I.=Sta. 161+60.35 to find Ste. of P. C. <br /> and P.T. 0_62° IV D=S°20'. From Table IV for P curve T_ <br /> 8454.1 and+g%-414.49 ft. From Table V correction=--.36 or T <br /> f 1 414.85 ft. P. C.=4Sta..P.I.-T=157+45.50. Also from (4),L� <br /> I 746.00 and P.T. .P.C.+L=164+91.50. <br /> er :ta <br /> I i p .- Teagent offsete vary (approidmately) directly with <br /> D aifd wit3t square of the distance. Thus tangent offset or Sta. <br /> f 15B cal above curvehs 2.16 it,found as follows. From Table III tangdut' <br /> offset for 100 ft.-7.27 ft. Distanoe-158--Sta.P. C.-w54.50;hence <br /> offwt=7.27 (54.50+100P=2.16 ft. Also square of any distance <br /> divided by twice the radius uals(a proximately)the diA&nc&from <br /> tangent to Carve. Thus (54=+(2x 688.26)-2.18 fJ. <br /> :paDeedm&-4-�eed4n an 3J D for 100 ft., i/D for 50 ft., <br /> ptC, For a it.�(ia mmirtds).3 is C x 'or�deff.for 14tt.from Table <br /> II1 x C, )'or 9* :'158 dE a curves I3x 54,5 x B H=136.2' or <br /> f I ' r 18.2,oe+."x bi.b•� 36.21from Table III. For Eta. 159 d0flec- <br /> tion lwgle"4016.2':+8°20 +2=vr. 26.21,etc. <br /> Zadrrnal _Mey bed in Amite manner to'tangents. #ius <br /> E tot e"move ie 91.37 For from Table IV for r curve F-960.6 <br /> fCr 8°.2tY-W-G+$fig .27 and from Table V correction=.10 or <br /> 1 6 1.37.ft, Or suppose ',a=4r and B is measured and found to be <br /> 42.ff. What is DR From Table IV_8=230.9 and+42-5.5 or.D= <br /> 5°30'. <br />