Dr. Jung, of Zurich,
thought that it would be a very simple matter to record these
varying emotions, and the psychometer is the result--simple and
crude to-day compared with what we have a right to expect in the
future.
"A galvanometer is so arranged that its action swings a mirror
from side to side, reflecting a light. This light falls on a
ground-glass scale marked off into centimetres, and the arrow is
made to follow the beam of light. A pen pressing down on a metal
drum carrying a long roll of paper revolved by machinery records
the variations. Dr. Guthrie, who had charge of the recording,
simply sat in front of the ground glass and with the arrow point
followed the reflection of the light as it moved along the scale,
in this way making a record on the paper on the drum, which I see
he is now holding in his hand.
"Mrs. Willoughby, the subject, and myself, the examiner, sat here,
facing each other over this table. Through those metal domes on
which she was to keep her hands she received an electric current
so weak that it could not be felt even by the most sensitive
nerves.
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