Untersuchungen ueber die Ausbreitung der elektrischen Kraft [Investigations into the Propagation of Electric Force], [1892]. 1 page, folio, small section pasted at bottom, signed at head and in the text, few emendations and corrections, with German and English typed transcripts." /> HERTZ, Heinrich Rudolph (1857-1894). Autograph manuscript signed ("Dr. Heinrich Hertz"), Hertz's draft of the announcement of the publication of his <I>Untersuchungen ueber die Ausbreitung der elektrischen Kraft</I> [<I>Investigations into the Propagation of Electric Force</I>], [1892]. <I>1 page, folio, small section pasted at bottom, signed at head and in the text, few emendations and corrections, with German and English typed transcripts</I>. | Christie's