title: [A Fragment Of De speculis comburentibus of Regiomontanus Copied by Toscanelli and Inserted in the Books of Leonardo (Codex Atlanticus, 611rb / 915ra)].
abstract: This article studies a fragment on the conic sections that appear in the Codex Atlanticus, fols. 611rb/915ra. Arguments are put forward to assemble these two folios. Their comparison with the Latin texts available before 1500 shows that they derive from the De speculis comburentibus of Alhacen and the De speculis comburentibus of Regiomontanus, joined together in his autograph manuscript (Vienna, Oster. Nationalbibliothek, Cod. 5258). Having identified the sources, and discussed their mathematics, the issue of their transmission is targeted. It is shown that these notes were written by Paolo dal Pozzo Toscanelli, through whom they reached the notebooks of Leonardo da Vinci.
authors.affiliation: a PLC , Université de Grenoble , France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Raynaud
mesh_terms: D005858:Germany; D049668:History, 15th Century; D049669:History, 16th Century; D007558:Italy; D008373:Manuscripts as Topic / Q000266:history*; D008433:Mathematics / Q000266:history*