. Railroad construction. Theory and practice . e of thestock-rail, one side of the base of thepoint-rail being entirely cut away. Asmay be seen in Fig. 133, although the in-fluence of the point of the rail in movingthe wheel-flange away from the stock-railis really zero at that point, yet the rail hasall the strength of the web and about one-half that of the base—a very fair angle-iron. The planing runs back in straightlines, until at about six or seven feet backfrom the point the full width of the head isobtained. The full width of the base will only be obtained atabout 13 feet from the point
. Railroad construction. Theory and practice . e of thestock-rail, one side of the base of thepoint-rail being entirely cut away. Asmay be seen in Fig. 133, although the in-fluence of the point of the rail in movingthe wheel-flange away from the stock-railis really zero at that point, yet the rail hasall the strength of the web and about one-half that of the base—a very fair angle-iron. The planing runs back in straightlines, until at about six or seven feet backfrom the point the full width of the head isobtained. The full width of the base will only be obtained atabout 13 feet from the point. An 80-1 b. rail is 5 inches wdde atthe base. Allowing f more for a spike between the rails, thisgives 5f as the minimum width between rail centers at thejoint. The minimum angle of the switch-point (using a 15-foot 5 75 point-rail) is therefore the angle whose tangent is — = i-D /\ I^ .03914, w^hich is the tangent of 1° 50. S^^dtch-raiis are some-times used with a length of 24 feet, which reduces the angle ofthe swdtch-point to 1° Ftg. 133. 259. Switch-stands. The simplest and cheapest form is theground lever, which has no target. The radius of the circledescribed b}^ the connecting-rod pin is precisely one-half thethrow. From the nature of the motion the device is practically 270 RAILROAD CONSTRUCTION. § 260. self-locking in either position, padlocks being only used to pre-vent malicious tampering. The numerous designs of uprightstands are always combined with targets, one design of which is
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