Author : James C. Nagle
Release : 2013-09
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Kind : eBook
Book Rating : 643/5 ( reviews)

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Book Synopsis A Field-Manual for Railroad Engineers by : James C. Nagle

Download or read book A Field-Manual for Railroad Engineers written by James C. Nagle. This book was released on 2013-09. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...To Find the Radius of a Curve having the Same P.C. as a Given Curve, but ending in a Parallel Tangent. Iu Fig. 41 let the perpendicular distance between tangents be p, and AB be the located curve; AO, = Bi is required. Fikbt Metiiod.--Draw OH ai right angles to 0, E; then 0,7? = 0, i?+ i?G + OE, or i?, = (Bi-B) cos i f-B + p Fia. 41. From which R, Second Method.--A, B, and E lie ou the same straight line, since 1 is the same for both curves. In triangle BOE angle EBG = 1, and AE = AB + i?-K is the long chord for curve of degree D; therefore If desired, R may be found by (12, ) or Table I. Thikd Method.--Draw FL parallel to OiE; then AF = AC--CF, the tangent distance for second curve; hence Remark.--If transit is set up at B, it will be well to set E by measurement from B, to serve as a check when the curve is run in from A. Article 9. Compound Curves. A. Location Problems. 117. Given Two Unequal Tangents, their Intersection-angle, and One Radius, to Find the Other Radius of a Compound Curve uniting Tangents. In Fig. 43, AU--7, ami BU = 1 are the known tangents, AOi = T?i the known radius. BO, = Rt and the angles i, and 1% must be found before curve can be located. By Table 1 this is seen to be the radius of a 3 1, curve. The length of first branch is 258.3 feet, and of the second 821.3 feet; hence the P.C.C. falls at 112 + 58.3, while the P.T. is at sta. 120 + 79.6. 118. Given the Long Chord from P. C. to P. T. of a Compound Curve, the Angles it makes with the Tangents and One Radius, to Find the Other Radius and the Central Angles. In Fig. 42 AB is known, as also the angles HAB = a and HBA = b. Two angles and one side of the triangle HAB are known, and the sides IIA = T, and B.B = T, may be found, after which the solution is the same..