Grünewald, Fritz (d. 1925)
German engineer who pioneered instrumental control for
testing psychical phenomena. His ingenious laboratory instruments
were exhibited at the 1921 International Congress for
Psychical Research in Copenhagen, and they served as a model
for research laboratories in Paris, London, Berlin, Munich, and
Vienna. Grünewald mostly experimented with psychics Johannsen,
Einer Nielsen, Jan Guzyk, and Anna Rasmussen. He
also investigated the case of Eleonore Zügun.
Sources
Grünewald, Fritz. Physikalisch-Mediumis-tische Untersuchungen.
N.p., 1920.
