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Geometry--Early works to 1800, Mathematics--Early works to 1800, Optics--Early works to 1800 Manuscripts Latin--17th century, Manuscripts European
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Porter, Dot, "Facsimile of LJS 201, Evangelista Torricelli letter to Marin Marsenne" (2015). Schoenberg Institute for Manuscript Studies (SIMS): EBooks. 202.
Letter in Torricelli's cursive hand to Father Marin Mersenne, praising a lens owned by Ferdinando II, promising to send a lens he himself made, and discussing spherical geometry. Written from Florence, dated 9 January 1645, on a single paper leaf with a watermark of a bishop's miter. Tipped into a modern morocco binding with gilt title and erroneous date of 1649.