ALS signed “M. Faraday,” one page, 4.5 x 7, March 26, 1861. Handwritten letter to "Renee," commenting on an apparatus received from the Bavarian physicist and inventor Carl August von Steinheil, who specialized in optics and telegraphy. In part: "I have received Steinheil's note & bill (which I enclose) also the apparatus has arrived…if I knew how much 137 fl. were I would send you the money with this note. If you cannot pay for me can you tell me the sum to pay & how I am to pay it and let me have the bill & note again that I may write to him." In very good to fine condition, with stains and wrinkles to the corners from old mounting remnants on the reverse. In diary entries made between November 25, 1861 and March 12, 1862, Faraday recorded his experiments with Steinheil's apparatus—these are thought to be the last scientific experiments he ever conducted.
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