. The railroad engineer's practice . 1^—^-^^^ X = [/ 1 + COS. Fsin. F tan. tV F It is usual to designate frogs by numbers which expressthe relation between the base and altitude of the triangleforming the point of the 115 Thus, a No. 8 frog is one whose length is 8 times thebase ; J) C = 8 A li. The above equation then reduces to X zz: 2 ff n,where n = the number of the frog. The radius of the turnout is = — ^ q. sin. F For a No. 8 frog, F — 7^ Q^- It is the usual practice tospike down 5 feet on each side of the frog straight, or,calling the distance from point to end of frog 2 feet,the
. The railroad engineer's practice . 1^—^-^^^ X = [/ 1 + COS. Fsin. F tan. tV F It is usual to designate frogs by numbers which expressthe relation between the base and altitude of the triangleforming the point of the 115 Thus, a No. 8 frog is one whose length is 8 times thebase ; J) C = 8 A li. The above equation then reduces to X zz: 2 ff n,where n = the number of the frog. The radius of the turnout is = — ^ q. sin. F For a No. 8 frog, F — 7^ Q^- It is the usual practice tospike down 5 feet on each side of the frog straight, or,calling the distance from point to end of frog 2 feet,there would be 12 feet straight. The g in the formula (fora 4 feet 9 inches gauge) would bo reduced to 3 feet 10|-inches. In this case, then, cc =: 62 feet and Ji = , orabout an 11 35 curve. Five feet of the switch rail is spikedfast. In order to have a thiow of 5| inches, the switchrail should be 27 feet lono^. The distance from the mov-able end of the switch rail, or point of switch, to the pointof the frog is, then, 47 feet. This is an ordinary switchon railroads. To find the distance from frog to frog on a crossing : CL Call the distance from point of frog to point of tangent=: distance measured on t
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Keywords: ., bo, bookcentury1800, bookdecade1880, bookidrailroadengineer00clee
