. The railroad engineer's practice . t 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
. The railroad engineer's practice . t 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 the track from frog to frog : ^ f/ rf e = ^ r^—F^ C COS. ±1. tan. F sm. FThen, d = \/e + a^ For a No. 8 frog, when g = 4-J, a = 7^, and c = 7, e = ,d= 116 To finfl the proper angle for the middle frog in a three-throw switch :. Ver. Sin. ^F . ^^r F. When two No. 10 frogs are used, we find F = 8« 6, andthe third frog should be a No. 7. When two No. 8 frogsare used, the other should be a No. , or, say 6. Bill of crossing lumber, single switch : 3 ties 9i feet long. 22 221 521 .10 .10^ .11 .lU .12 .14 .15 .16 1 switch tie 15 feet long, 16 inches of crossing lumber, double connection :6 ties 9^ feet long. 2444216 .10 .10.^ .11 • IH .13 .19 2 switch ties 15 feet long, 16 inches of crossing lumber, triple connection :2 ties 0 feet long. 8228 10 ii « 11 ii (C 12 ii. (( 13 ii (( 117 1 14 feet long. 2 15 • 1 16 3 17 3 18 4 19 2 20 1 switch tie 15 feet long, 16 inches wide. CROSS TIES. These should be hewed (not sawed nor split) on two sides,cut square at the ends, and stripped of the bark beforedelivery. They should be 8^ feet long and 8 inches of them should measure not less than 8inches across the hewed surfaces, and one-fo
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