Autograph letter signed : Bonn, to an unidentified recipient, 1890 Mar. 2.
Related Entities
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Hertz, Heinrich, 1857-1894
http://n2t.net/ark:/99166/w6vr3rjk (person)
Heinrich Hertz (b. Feb. 22, 1857, Hamburg, Germany–d. Jan. 1, 1894, Bonn, Germany) was a German physicist who first conclusively proved the existence of the electromagnetic waves theorized by James Clerk Maxwell's electromagnetic theory of light. The unit of frequency — cycle per second — was named the "hertz" in his honor....
Geigy-Hagenbach, Karl
http://n2t.net/ark:/99166/w6gm9n5w (person)