Thomas Edison invented as many as two devices for communication with the Souls of dead people. The first appeared in 1895. A device that could catch the waves emitted by a clot of energy (soul) after the physical death of the body.
In 1916, Dutch inventors J. Matla and G. Zaalberg van Zelst designed the "dynamistograph" - an electromechanical printing device with elements of a wired and wireless telegraph. The main part of the device was a key, which printed letters and made so sensitive as to respond to the smallest vibrations caused by the spirits.
The dynamistograph seemed to experts to be a reliable and "objective" apparatus, the device was made of a set of oscillators, batteries, a telephone receiver, a piece of radium and a mysterious "metal transmitter". The inventors announced it as a "telegraphic system for communication between worlds" that can do without human intermediaries (mediums).
At the same time, another inventor, William Cook, wrote to Thomas Edison that he had learned to photograph a human soul on film. Impressed (perhaps he saw the photographs), Thomas Edison in 1920 constructs a new apparatus, which he called the duophone. For its manufacture, he used 8 kg of gold, 20 kg of silver and 300 kg of copper. With great difficulty, but Edison managed to get a patent for it.
After that, Edison entered into an agreement with his colleague William Dinwiddie that the one who dies first of them will contact the second with the help of a duhphone. Dinwiddie was the first to die in 1920. In an interview with Scientific American magazine, Edison spoke about the connection through the apparatus with the deceased.
The paradox is that Edison believed neither in hell, nor in heaven, nor in transmigration. But at the same time he was convinced that the souls of man are settled in the universe after the end of earthly life. He believed that in nature all information exchange occurs at the electromagnetic level. All that was needed was a supersensitive telephone capable of picking up subtle signals.
Journalists from "Modern Mechanix Magazine" in 1933 attended a session using a necrophone, where a connection with an incorporeal entity was established. And they were among the last to see the duhphone. After some time, the device fabulously disappeared.
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10 years after Edison's death, the medium Mary Olson summoned the spirit of the great inventor in a seance.
And the spirit told where the schemes of the invention lie.
The diagrams turned out to be exactly in the place where the spirit indicated to look. American researchers J. Gilbert Wright and Harry Gardner restored the duhphone from these drawings. And more recently, in 2004, when digitizing the archive of the Federal Patent Office, they found patent WW 345-S 444, which was issued to Edison, officially certifying that the device was operational.
But it was no longer possible to use the found Edison's spirit phone technologically, communications were outdated, and there was no way to connect to the telephone line.
Finally, in 2009, scientists developed an adapter for connecting the invention to modern telecommunication systems. The old duo was hooked up to recording equipment and electromagnetic field control sensors. After connecting, the incredible began: calls began to arrive, one after another, they counted more than 120 pieces. Everyone present came up and picked up the phone. This was done to ensure that there was no doubt about the honesty of what was happening.
Official science has explained the phenomenon as follows: upon contact with the duhphone, the areas of the cerebral cortex are stimulated, which affects its perception of reality at the time the apparatus is operating. Thus, a figurative representation is created, perceived as communication with spirits.
And this is where the story and fate of this curious invention of Thomas Edison ended.