. The street railway review . ar may operate through the block at full speedwithout danger of injuring tlie contact principle and details of operation of the signal can be best A helical spring keeps the levers in position against the both connectors aivl disconnectors, this rod carries a copperterminal connected to the track rail as a ground. CThcsc terminalsare indicated as a, b, c and d in the diagram.; In the connectorsthe roti has cut in one side a notch with which dogs, k and I, en-gage when the rod is moved by the passage of a car and when thusengaged the connector
. The street railway review . ar may operate through the block at full speedwithout danger of injuring tlie contact principle and details of operation of the signal can be best A helical spring keeps the levers in position against the both connectors aivl disconnectors, this rod carries a copperterminal connected to the track rail as a ground. CThcsc terminalsare indicated as a, b, c and d in the diagram.; In the connectorsthe roti has cut in one side a notch with which dogs, k and I, en-gage when the rod is moved by the passage of a car and when thusengaged the connector rod is held over in a position lo make con-tact between terminals, b and f for c and rl; until released by ac-tion of the solenoid M for connector \i or solenoid N for con-nector C. The solenoid M is enclosed in the same Ihjx as the cir-cuit terminals b and i. The wiring to connect the terminals c, I, g and h with the signallamps, solenoids and trolley wire is clear from the diagram. big. 2 shows the contact operating Now suppose no signal lamps to be burning, the conditions shownin Fig. I. Let a car approach from the north. On striking dis-connector D, the contact is made between d and h, completing acircuit from the trolley wire through wires 11, 10 and 9; this hasno effect since the dog k is not engaged with the rod of C. Werethis engaged the contact at D would actuate the solenoid andbreak the circuit through C. The contact at D is a momentaryone only. The car continues and on passing connector C contact is madebetween c and g (the dog k engages the rod and makes the con-tact a permanent one) and a circuit through wires 8, 7 and 6completed so that the white lamp W at the north end of the blockand the red light R at the south end of the block are lighted,protecting the car and in<licating that the block is occupied by asouth-bound car. ^ On leaving the block passage over B completes a circuit through12, II and 10 and actuates the solenoid N, breaking contact c an
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
