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It's common practice
in England to ring a telephone by signaling extra voltage across
one side of the two wire circuit and ground (earth in England).
When the subscriber answers the phone, it switches to the two
wire circuit for the conversation. This method allows two parties
on the same line to be signaled without disturbing each other.
Anyway, an elderly lady with several pets called to say that
her telephone failed to ring when her friends called; and that
on the few occasions when it did ring her dog always barked
first. The telephone repairman proceeded to the scene, curious
to see this psychic dog.
He climbed a nearby telephone pole, hooked in his test set,
and dialed the subscriber's house. The phone didn't ring. He
tried again. The dog barked loudly, followed by a ringing telephone.
Climbing down from the pole, the telephone repairman found:
1) A dog was tied to the telephone system's ground post via
an iron chain and collar.
2) The dog was receiving 90 volts of signaling current.
3) After several such jolts, the dog would start barking and
urinating on the ground.
4) The wet ground now completed the circuit and the phone would
ring.
Which just goes to show, that some problems can be fixed by
just peeing on them.
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