Powell, W. H. (ca. 1879)
Slate-writing medium of Philadelphia with whom Epes Sargent
conducted experiments in Boston on June 21, 1879.
Under a chandelier, ‘‘without touching the surface of the slate,
he made motions over it with his forefinger in the air, as if making
a drawing, and then writing something. I reversed the slate,
and there on the under surface, was a neat drawing of a flower,
and under it in clear, bold letters, the word ‘Winona.’ ’’ Powell
was tested by a committee, including chemists and physicians
in 1879 in Philadelphia. The committee reported Powell’s
slate-writing was ‘‘one of those peculiar psychological manifestations
that we cannot account for.’’

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