Mr. William Walker, who had ghost handwriting appear in a photograph of himself and who also appeared as a ghost (spirit) likeness in his family's photograph, was reported by the Crewe Circle of psychic-mediums to have written a letter from the other side of the grave.
The"psychograph" or psychic writing obtained during mediumship (below left) matched up with an older letter (below right) directly from the hand of William Walker while alive. Arthur Conan Doyle offers this as evidence in support of ghosts, spirits, and the use of psychic-mediums to contact the deceased.
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Crewe Circle Psychic Writing: Ghost Writing Analysis