Hints and observations for those investigating the phenomena of spiritualism (1918)
Crawford, W. J. (William Jackson), 1880-1920, Harry Houdini Collection (Library of Congress) DLC · New York : E.P. Dutton & Co. · leaf 97
Fig. 4 PHENOMENA OF SPIRITUALISM 87 of wood A, B, C, and D are hinged to E,so that they can move freely up and down.Underneath each of these flat pieces of wood asmall piece of helical spring is fixed to the sur-face of the table, and each of the flat pieces rests … on the top of the spring. Upon the surface ofthe table and upon the lower surfaces of A, B, C,and D, metal contacts are fixed, which are con-nected together by insulated copper wire andput in the circuit of an electric ball which isfixed upon the wall. Across the centre of A,B, C, and D a chalk…
Spiritualism
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