Books about Wehnelt:
Über die Wärme-Leitungsfähigkeit der Metalle. Herausgegeben von A.Wehnelt. (=Ostwald's Klassiker der exakten Wissenschaften... by G./ Franz, R. Wiedemann (1927)
Hoechst: Untergang des deutschen Weltkonzerns von Wehnelt, Christoph (2009) Gebundene Ausgabe by Christoph Wehnelt (1000)
Strom- und Spannungsmessungen an Kathoden in Entladungsröhren, Habilitationsschrift... von Dr. phil. Arthur Wehnelt... by Arthur. WEHNELT (1901)
Studien ueber den dunklen Kathodenraum, Inaugural-Dissertati... von Arthur Wehnelt,... by Arthur (b.1871 in Rio de Janeiro). WEHNELT (1898)
Zirconium as the base metal for studying the nature of thermionic emission from Wehnelt cathodes: Project for... by Nicholas H Johns (1948)
Wiki information Wehnelt:
A Wehnelt cylinder is an electrode in the electron gun assembly of some thermionic devices, used for focusing and control of the electron beam. It is named after Arthur Rudolph Berthold Wehnelt, a German physicist, who invented it during the years...
Arthur Rudolph Berthold Wehnelt was a German physicist, noted for important contributions in the fields of X-ray physics, gas discharges and electron emission.