. Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States . f the chord. Rad. of Curve. Ordinates on a 100 Feet Chord at Degree. Feet. \4. -4 % v. s. 5 1146 6 955 7 819 1-43 i-53 8 717 I-3I i-75 9 637 10 574 11 522 •LOCATION. 3i Rad of Curve. Ord mates on a 100 Feet Chord at Degree. Feet V Va is V. s 12 478 I ■IS 13 442 I .24
. Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States . f the chord. Rad. of Curve. Ordinates on a 100 Feet Chord at Degree. Feet. \4. -4 % v. s. 5 1146 6 955 7 819 1-43 i-53 8 717 I-3I i-75 9 637 10 574 11 522 •LOCATION. 3i Rad of Curve. Ord mates on a 100 Feet Chord at Degree. Feet V Va is V. s 12 478 I ■IS 13 442 I .24 14 4IO I •34 15 383 I 44 3-07 16 359 1 •53 3-28 3-50 17 338 1 63 348 372 18 320 1 73 3-93 •9 303 1 82 3-90 20 288 1 .92 3-29 4-37 Compound Curves. It is often found in practice that a simple circular curve willnot fit the ground in a satisfactory manner ; but that the lineneeds to curve more sharply at one place than at another. Insuch cases we employ what is termed a compound curve, inwhich several curves of different radii are combined. Thus, inFig. 18, to connect the tangents A A and B B we curve from A. Fig. 18. 32 MANUAL FOR RAILROAD ENGINEERS. to E upon the centre C, and radius A C ; from E to E uponthe centre C, and radius E C ; and from E to B upon the centreC, and radius E C. In order that the adjoining curves shouldbe properly connected, they should have a common tangent atthe point of compound curvature, as at E and E ; or, in otherwords, the centre of the cur. ^ from E to E must lie in the radiusE C of the curve from A to E ; and in the same manner thecentre C must lie in the radius E C produced. Reversed Curves. Again, it is often necessary to reverse the direction of the cur-vature, as in Fig. 19. To connect AA with B B, we may com- 2 B E / D c B F /r\ D / ^^ F y A C E A C Fit 19. mence by curving from A to E on D as a centre, thence with Cas a centre from E to R, the point of reversing,
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherbosto, bookyear1883
