Researches in the phenomena of spiritualism (1874)
Crookes, William, 1832-1919 · London : J. Burns · leaf 37
furnished with an automatic register, D. The balance issuspended from a very firm tripod support, E. The following piece of apparatus is not shown in thefigures. To the moving index, o, of the spring balance, a Fig. 3
Spiritualism · Parapsychology
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