As nearly as I could make
out, in this case the galvanometer was so arranged that its action
swung to one side or the other a little concave mirror hung from a
framework which rested on the table. Directly in front of it was
an electric light, and the reflection of the light was caught in
the mirror and focused by its concavity upon a point to one side
of the light. Back of it was a long strip of ground glass and an
arrow point, attached to which was a pen which touched a roll of
paper.
On the large table in the library itself Kennedy had placed in the
centre a transverse board partition, high enough so that two
people seated could see each other's faces and converse over it,
but could not see each other's hands. On one side of the partition
were two metal domes which were fixed to a board set on the table.
On the other side, in addition to space on which he could write,
Kennedy had arranged what looked like one of these new miniature
moving-picture apparatuses operated by electricity. Indeed, I felt
that it must be that, for directly in front of it, hanging on the
wall, in plain view of any one seated on the side of the table
containing the metal domes, was a large white sheet.
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