Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 128
Parallel tracks by elliptic curve. h=lti. w=2v. 17=2 7,, C sin. W „ Csiii.w C =-0-: » C = o ^~T>-, 2 sm.u 2 sm. 7 See example for ordinates. 137. Tracks not parallel by elliptic arc. Angle of the arc = W-\- w. Ordinates to be calculated from the table. 138. Spring of Rails.1-5 U R -= spring m… … 139. Inclination of tracks in curves. tan.y= ^^5* h— G sin.v.15 it, Meaning of letters, see example. 120 Excavation and Embankment. EXCAVATION AND EMBANKMENT. Example 1. The Road-way of an excavated channel is r = 15 feet, the depthD = 9 feet, and the breadth at the top b ~ 46£ feet. Require the…
Mechanical engineering · Engineering
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