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William J. Crawford describes his investigations of physical phenomena reported during séances, with particular attention to raps, movements and the levitation of objects. His account brings experimental observations together with attempts to measure the forces he believed were involved.
The book records arrangements used in the investigations and the reasoning through which Crawford interpreted the results. Illustrations and examples accompany the discussion. Readers encounter a detailed historical account of one investigator’s approach to physical mediumship, preserved here in the original scanned pages rather than a modern retelling.