There are a couple of interviews in which the great inventor Thomas Edison says he is working on an apparatus in which to contact those who have passed on.

The truth of the matter is that mediums and séances were all the rage in his time. So being the scientist that he was he wanted proof that these were real meetings of the dead and not just parlour tricks.

He once said in a quote I found on about.com

"I don't claim that our personalities pass on to another existence or sphere," he told Scientific American. "I don't claim anything because I don't know anything about the subject. For that matter, no human being knows. But I do claim that it is possible to construct an apparatus which will be so delicate that if there are personalities in another existence or sphere who wish to get in touch with us in this existence or sphere, the apparatus will at least give them a better opportunity to express themselves than the tilting tables and raps and ouija boards and mediums and the other crude methods now purported to be the only means of communication."

No one has found anything of this nature that he was working on, nor did they find prototypes or drawings. Did Edison know the secret and contacted the dead, only to find that it was technology that was dangerous and destroyed it.

We will never know.