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He began by winding
coil after coil of copper wire about the storeroom in the basement
of the museum. It was not a very difficult matter to conceal it,
so crowded was the room, or to lead the ends out through a window
at the opposite side from that where the window had been broken
open.
Up-stairs in the art-gallery he next installed several boxes such
as those which I had seen him experimenting with during his tests
of selenium on the afternoon when Mr. Spencer had first called on
us. They were camera-like boxes, about ten inches long, three
inches or so wide, and four inches deep.
One end was open, or at least looked as though the end had been
shoved several inches into the interior of the box. I looked into
one of the boxes and saw a slit in the wall that had been shoved
in. Kennedy was busy adjusting the apparatus, and paused only to
remark that the boxes contained two sensitive selenium surfaces
balanced against two carbon resistances. There was also in the box
a clockwork mechanism which Craig wound up and set ticking ever so
softly.


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