Autograph letter signed : Bonn, to Herrn Keiser & Schmidt in Berlin, 1893 Oct. 12.
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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....