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Torchwood Three acquired the machine by tracing alien energy signals from the device while still in Bernie's possession. After a chase that led her to a train station, Gwen Cooper ended up with Bernie's hoodie, with the machine in a pocket. She mentally time-slipped back in time and saw a ghost from World War II, not a phantom in the conventional sense, but a quantum echo of the long-ago emotional state of a living person, Tom Flanagan. The other half of the machine, also at Bernie's, snapped in neatly with the first and picked up visions of the future.
The transducer used nanotechnology. It converted the quantum traces of emotional events, both past and future, into a form that humans could mentally experience.
When activated, apparently by touching the buttons on the front, the user was shown a emotional event from the past or future. As well as showing the actual event, the transducer also transmitted the thoughts of the people in the event. (TV: Ghost Machine)
Behind the scenes Edit
Torchwood website Edit
The series 1 version of the Torchwood website had an article written by Captain Jack Harkness titled "Ghost machine explained". It said that instead of looking at the transducer from the perspective of flesh and blood beings like humans, the device had to be seen as how a transdimensional being — who can travel back and forth through time as if it was water — would observe the universe. Jack explained that "every" traveller needs a map — some equivalent of GPS. Jack speculated that the quantum transducer functioned as a "ghost map" that locked onto quantum "hot spots", which humanity perceived as ghosts to help the transdimensional being find out where he was in time and space. He says that this is why it kept switching itself on around a "big emotional echo" — it's essentially "a mobile phone scanning for a signal".