From early mechanical devices to modern inventions, attempts to communicate with spirits have repeatedly reflected humanity's fascination with the unseen. This historical exploration examines machines and instruments designed or imagined to detect, record, or contact supernatural entities. It places these inventions within the cultural history of spiritualism, technology, paranormal investigation, and popular belief. The book reveals how scientific language and technological optimism were sometimes applied to questions of ghosts and the afterlife, offering an intriguing look at the boundary between invention, belief, experimentation, and the desire to communicate with the unknown.

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