Discovery of the first human stereotactic instrument.
It has been uncovered that the first human stereotactic instrument was designed around 1918, but was never put to human use. It was designed after the Horsley-Clarke animal apparatus by an engineer, Aubrey Mussen. The history surrounding that historical event is revealed in a series of letters between the engineer and his son some years later.
D049673:History, 20th Century; D013238:Stereotaxic Techniques / Q000266:history*; D014481:United States