Carl Reichenbach AutographAutograph letter signed, 1 1 2 pages (both sides), 9 x 11 inch, 10. 09. 1860, in German, to Carl Reichenbach requires an instrument for measuring voltage (probably the galvanometer) from German physicist Johann Christian Poggendorff (1796 1877), written and signed in black ink "Reichenbach", with creasing along the left edge, intersecting letter folds, and one tear (0,5 inch) at each vertical edge in fine condition. "Hochwohlgeborner Herr
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