AT & T Long Lines relay tower in Indiana constructed with the slip-form method.
2.
Electrical accessories, such as the line relays, motor relays and power fuses are mounted in a separate removable chassis called the Electrical Service Unit.
3.
This was possible because each subscriber had a dual armature line relay, and in the parked condition the low-current armature was operated but the other not.
4.
That blackout began around rush hour when a transmission line relay failed as power lines operated near maximum capacity between Niagara Falls and New York City.
5.
When flooded cables or other conditions made this a real problem, switch staff would open the cable, or paper the off-normal contacts of the crossbar switch, or block the line relay from operating.
6.
Jay Payton's RBI single tied the score in the second, Jason Tyner led off the fifth with a single and scored from first on Mike Piazza's two-out single to right-center, beating Belliard's off-line relay.
7.
The line circuit was much like that in 1XB with a Line Relay for alerting the exchange to a trip condition, and the Vertical Off Normal contacts of the switch vertical serving as cutoff relay.
8.
They were the Line Relay ( LR ), which was operated when the customer picked up the handset and which generated the calling signal, and a K relay which gave the correct tones and prevented spurious calling conditions.
9.
For those which were likely to be needed frequently or urgently in every exchange, such as a Subscribers Line Unit ( a single unit containing the line relays and A-switches for five customers ), a spare unit was held in every exchange.
10.
Stayed masts are however located at the UHF relay stations at Londonderry and Strabane ( respectively former BBC and ITA 405-line relays ) and at Black Mountain, the former ITA 405-line main station and current transmitter of Channel 5 that is sited adjacent to Divis.
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