4to (272 x 206mm.), 51 leaves, diagrams and tables in text, anchor watermark, later additional manuscript title ("Matthie Berneggeri Notationes in Tractatum de instrumento proportionem") on flyleaf, later vellum boards (new front free endpapers added at the same time, containing the later manuscript title-page), modern half morocco case, a few small marginal stains
This is probably one of the 85 manuscripts acquired by Prince Boncompagni directly from the Albani family, in 1857/1858, though it is not entered in Enrico Narducci’s first catalogue of the Boncompagni manuscripts (1862), only in the collector’s posthumous catalogue (1892). The owners of the manuscript between its sale in 1898 and acquisition by Robert Honeyman are as yet unknown; a virtual reconstruction of the Boncompagni Library recovering provenance details is in progress (Ron B. Thomson and Menso Folkerts, Boncompagni Manuscripts: Present Shelfmarks, Beta Version 1.8, May 2013).
There are traces of old manuscript foliation on the leaves, but not in order, indicating that the quires may have been in a blank (foliated) book which was then taken apart and the quires reused for this manuscript (also visible in the stain on the fore-edge which occurred before this reassembly).
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