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Image from page 420 of “Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States ..” (18
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Identifier: handbookofrailro00vose
Title: Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States ..
Year: 1857 (1850s)
Authors: Vose, George L. (George Leonard), 1831-1910
Subjects: Railroads — Design and construction Railroads — Equipment and supplies Railroads — United States Equipment
Publisher: Boston, Cambridge : J. Munroe and Company
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign
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Text Appearing Before Image:
.CARS. WHEELS AND AXLES. 377. Of the mechanical details of car building it is notnecessary here to speak ; but of those matters which fit acar for special duty, and depend upon particular character-istics of any road, such as the gauge, something must besaid. The trend of the wheel tire, as remarked in ChapterXIII., is not turned cylindrical, but conical. A perfectlystraight road would of course require no cone upon thewheels ; the object of the latter being to vary the wheeldiameter when upon curves. The general practice is togive a certain standard cone to all wheels, for all gauges.This is quite wrong, as will be seen by the following for-mula, which is from Pambour on the Locomotive Engine.Fig. 156. Let m w, fig. 156, represent the outer rail, and nn the inner one.The circumferences upon thesame axles must evidently varyas the length of these curves,which are included between thesame radii. Let D, be the diameter of thefirst wheel, and d, that of the second ; and we shall have, nD
Text Appearing After Image:
or otherwiseand m in nn 71 d OTm = 3.1416Z), n n :^3.141G d. EQUIPMENT. 397 We have also, mm monn no Expressing the radius of curvature by r, and the halfgauge by e, the above proportion may be expressed by and alsoand finally mm r-\-e nn ~ ~r e D d r-f-er e D — d 2eD r-\-e This equation shows the difference in diameters thatought to exist between the inner and outer wheels, that therequired effect, (no dragging of the outer and no slipping ofthe inner wheel,) is produced. Example. Let the i-adius of curvature be … 1,000 feet, The gauge of the road, 6 The wheel diameter, ….. 4 And the formula becomes 2ec^ 24 ^^, ,—J—=—— = .024 feet,r-\-e 1003 or .288 inch on both wheels, or 0.144 inch for each wheel;which for four inches breadth, gives a curve of ^-^ of thewidth, or decimally, 0.144, and vulgarly, \ of an inch. Fora three feet wheel, the rule gives a cone of 0.11 inch. Note. — Messrs Bush and Lobdel cone their wheels 0.08 inches in a four inchtire; or \ inch per foot.
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