. The railroad and engineering journal . m below toa vertical position, we must turn the pulley Q and give thewire Aa movement which lowers or raises the wing of thesemaphores, through which the signal is given to the en-gineers. These signals can only be changed when the correspond-ing switches are in their proper positions for the passageof trains ; for that purpose, on the line of transmission ofthe signal, there is placed a locking-bolt for the switch,as shown in fig. 30. On the inside of a cast-iron case is a pulley /, which canturn around on a vertical axis, and is furnished below witha
. The railroad and engineering journal . m below toa vertical position, we must turn the pulley Q and give thewire Aa movement which lowers or raises the wing of thesemaphores, through which the signal is given to the en-gineers. These signals can only be changed when the correspond-ing switches are in their proper positions for the passageof trains ; for that purpose, on the line of transmission ofthe signal, there is placed a locking-bolt for the switch,as shown in fig. 30. On the inside of a cast-iron case is a pulley /, which canturn around on a vertical axis, and is furnished below witha small lug e. When the switch is in proper position thislug fits into a slot made on the bar r, depending from wto the switch rail. When the switch rails are not fully incontact, or when the position of the switch is changed, this piston-rod s j this is drawn down by the counterweight ofthe lever r, and can then raise itself, the apparatus takingthe position shown in fig. 32 ; the lever H is then set freeand the semaphore can be When the signal has been put back at Stop, it is againlocked by pressing on the button K, which causes the leverr to descend into the slot u. If now we look back at figs. 29 and 30 we will see thateach signal lever H has corresponding to it a handle h,which the signalman can use from left to right and vice M THE RAILROAD AND [January, iSSg. .ersa. Figs. 35, 36, and 37 show how these handles arein connection with the buttons Aand the rods j. Each of these handles, as shown in fig. 37, works a leverwith three arms ,tr • the branch z moves horizontallytoward the right or left one of the bars R. The branch _>■causes the lugs >i to enter into slots made on the bars de-pending from other signals ; from this it follows that thehandles // are interlocked with each other ; the lever ; i^^iii:g^^piR
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
