Walter Kaufmann (1871–1947) was a notable physicist known for his work in the early 20th century, particularly in the field of electromagnetism and the theory of relativity. He is best remembered for his experiments related to the measurement of the mass of electrons and their behavior in electric and magnetic fields. One of his significant contributions includes the Kaufmann–Bendixson experiments, which investigated the effect of electric and magnetic fields on charged particles.
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A physicist.[ref]
https://www.deutsche-biographie.de/gnd116193395.html. Biographical identity and professional specialization
Portrait of Walter Kaufmann (physicist)
. Walter Kaufmann (as credited on Commons); Niedersächsische Staats- und Universitätsbibliothek, Göttingen. Public domain (PD-old-75-expired / PD-Art / Public Domain Mark 1.0, as stated on Commons). Source usage terms, via Wikimedia Commons. Source.