Biometer of Baraduc
An instrument to register vibrations and nervous force of
human bodies. It consists of a needle suspended by a fine
thread under a glass shade. If the hand is brought near the
shade, the needle is deflected. The angle of deflection, according
to the inventor, Hyppolite Baraduc, depended on various
mental, physical, and moral conditions of the experimenter.
He believed that the biometer indicated aspects of such conditions.
Similar instruments intended to indicate nervous or psychic
force include the sthenometer developed by Paul Joire and the
De Tromelin cylinder. These are lightly suspended or balanced
indicators that have been tested extensively to preclude
the possibility of movement caused by air currents or heat from
the hand of the operator. Such movement is believed to be connected
with the dowsing faculty or with psychokinesis.