Experiments in psychical science : levitation, contact, and the direct voice (1919)
Crawford, W. J. (William Jackson), 1880-1920, Crawford, W. J. (William Jackson), 1880-1920. Reality of psychic phenomena, Harry Houdini Collection (Library of Congress) DLC · New York : E.P. Dutton & Co. · leaf 179
chalkline is drawn across each hinged piece of woodthree-quarters the distance from the outside.The hands of the sitters are kept beyond thechalk lines. The pressure on each piece of woodrequired to make the electric bell ring can benicely adjusted from an ounce to a pound or so.From each corner of… … Fig. 27
Parapsychology · Spiritualism
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