Experiments in psychical science : levitation, contact, and the direct voice (1919)
Crawford, W. J. (William Jackson), 1880-1920 · London : Watkins ; New York : E. P. Dutton & company · leaf 22
PLoofj LeveiL . Fig. 3. … of the table, and we have a fairly good idea ofwhat is taking place during the occurrence ofthe phenomenon. The psychic rods are usually quite invisible.
Parapsychology -- Research · Spiritualism
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