One person
owned that gun and used it. That is proved. It remains only to
connect that gun positively and definitely, as a last link, with
that person."
I noticed with a start that the revolver still had a stout cord
tied to it.
As he concluded, Garrick had begun fitting a curious little device
to each of our forearms. It looked to me like an electrode
consisting of large plates of German silver, covered with felt and
saturated with salt solution. From each electrode wires ran across
the floor to some hidden apparatus.
"Back of this screen," he went on, indicating it in the corner of
the room, "I have placed what is known as the string galvanometer,
invented, or, perhaps better, perfected by Dr. Einthoven, of
Leyden. It was designed primarily for the study of the beating of
the heart in cases of disease, but it also may be used to record
and study emotions as well,--love and hate, fear, joy, anger,
remorse, all are revealed by this uncanny, cold, ruthlessly
scientific instrument.
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