. Railway maintenance engineering, with notes on construction . B. Gear Operated (Century). C. CamC leraced vv denkirk). Fig. 80.—Switch Stands. rail, where they are held with equal pressure; at the same timethe position of the target and lamp changes to correspond. However, when the switch is thrown by hand, in the regularmanner, the arrangement is such that the springs remain inopera-tive and the throw is accomplished positively and with only tj^^ 142 RAILWAY MAINTENANCE ordinary resistance incident to throwing the switch points fromone position to the other. This is because the operator, wh
. Railway maintenance engineering, with notes on construction . B. Gear Operated (Century). C. CamC leraced vv denkirk). Fig. 80.—Switch Stands. rail, where they are held with equal pressure; at the same timethe position of the target and lamp changes to correspond. However, when the switch is thrown by hand, in the regularmanner, the arrangement is such that the springs remain inopera-tive and the throw is accomplished positively and with only tj^^ 142 RAILWAY MAINTENANCE ordinary resistance incident to throwing the switch points fromone position to the other. This is because the operator, when heraises the handle to throw the switch, releases, at the sametime, the spindle from the automatic mechanism, and once raised,the handle cannot be relowered, or the switch locked, until thepoints have been fully thrown. In some stands a breakable cross-arm is provided, and ifthe switch is run through when not properly set, this arm breakswithout further damage to the stand or points. This is unde-sirable, as the stand will then give a wrong indication. I
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
