Drawing of a jeweller's lens by Francois Pelgrim of Antwerp, according to an inscription by Lulls, from an album of jewellery designs. There is also a description inscribed by artist about the workings of the lens. The album consists of three preliminary leaves of contemporary laid paper (two with unidentified watermarks), forty leaves of vellum and three final leaves of paper corresponding to those at the front of the album. Inserted are nine sheets of paper and three of vellum bearing designs, notes, transcripts of letters etc. 92 pages, full-bound in contemporary calf skin, gold-tooled, gilt edges, with fragments of green silk ties on the fore-edges of the front and back covers. The drawings are in pencil, pen and ink, wash, body-colour and gold.