. gained by using the rules and principles given in thisbook, the Author submits it, without further preface, to the pro-fession, fully confident that its use will be practical proof of itsmerits. The tables and examples have been prepared with great care,and their accuracy may be relied upon. While the Author claims a fair share of originality in the follow-ing work, he would acknowledge many valuable suggestionsderived from Mifflins Piagrams, as also from Henck on Compoundand Reversed Curves, authors to whom he would refer thosewis
. gained by using the rules and principles given in thisbook, the Author submits it, without further preface, to the pro-fession, fully confident that its use will be practical proof of itsmerits. The tables and examples have been prepared with great care,and their accuracy may be relied upon. While the Author claims a fair share of originality in the follow-ing work, he would acknowledge many valuable suggestionsderived from Mifflins Piagrams, as also from Henck on Compoundand Reversed Curves, authors to whom he would refer thosewishing to follow the subject at greater length. On the manner ofworking an instrument Mifflin is very clear and concise. This workis designed especially for practical field engineers^ already familiarwith minor details. a H, Gincinyiatiy l^^^* ^xJimukx T n E ENGINEEES FIELD BOOK. FORMULAE FOR RUNNING LINES, LOCATING SIDE-TRACKS, &c. PROPOSITION I. Fig. 1.* To change the origin of a curve so that it shall terminate in a tangentparallel to a given tangent, F. Fy.,. Suppose the curve A C to have been described containing 60° ofcurvatiire, and that the distance G D equal 50 feet. We have by logarithms : Sine 60° (total amount of curvature), . OOSTSSl Is to R 10-000000 So is G D, 50 feet 1-698970 To AB rz 5778 feet, .... 1-76T439 r. I . GD 50 ^^„ Or by nat. sines = -. = = 6773. ^ sin. 60° -86608 Produce the tangent from A to B =: 57-73 feet; then make the * The diagrams in this work are not drawn to any exact scale, but are designedto represent merely the abstract geometrical relation of linos. 376 Formula for Running Lines, j curve B D equal A C ; that is A M C = B X D ; then the tangents ;! will be parallel. j This rule will apply to the origin of a compound curve, using the :total amount of curvature run. PROPOSITION II. Fig. 2. | Having a curve A B terminating in a tangent D F, it is required to jfind the radius of a curve that will give a tangent C G parallel to\D F at any g
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectenginee, bookyear1856
