. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . 2 vers J^—^vers J—vers Ji)(vers J—vers Jg) Although the various elements may be chosen as above with considerable freedom, there are limitations. For example, in Eq. 22, since R2 is always greater than 72j, the term to be | added to R^ must be essentially positive—, r^ sin A must be vers A • greater than R^ vers A. This means that Ty>Ry—.—j-, or that §69. ALiNEMENT. ?9 Ti>Ritsin^^J, or that Ti is greater th
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . 2 vers J^—^vers J—vers Ji)(vers J—vers Jg) Although the various elements may be chosen as above with considerable freedom, there are limitations. For example, in Eq. 22, since R2 is always greater than 72j, the term to be | added to R^ must be essentially positive—, r^ sin A must be vers A • greater than R^ vers A. This means that Ty>Ry—.—j-, or that §69. ALiNEMENT. ?9 Ti>Ritsin^^J, or that Ti is greater than the correspondingtangent on a simple curve. Similarly it may be shown that T2is less than R2 tan §i or less than the corresponding tangenton a simple curve. Nevertheless Tj is always greater than the limiting case when R2=Ri, 7^2 = ^i> ^^^ ^2 = ^1- 69. Modifications of location. Some of these modificationsmay be solved by the methods used for simple curves. Forexample * a. It is desired to move the tangent VB, Fig. 31, parallel toitself to VB. Run a new curve from the which shallreach the new tangent at B, where the chord of the old curve.
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
