Parts of the original apparatus that Leonard Carmichael (1898-1973), an American psychologist, and his Canadian colleague, Herbert Henri Jasper (1906-1999), used in the 1930s for recording human electroencephalograms. Dr. Carmichaelm who would later become the Secretary of the Smithsonian Institution, donated this apparatus to the Museum.
Ref: Leonard L. Carmichael and H. H. Jasper, “Electrical Potentials from the Intact Human Brain,” Science 81 (1935): 51-53.
Carl Pfaffman, “Leonard L. Carmichael,” Biographical Memoirs of the National Academy of Sciences (1980).