Labels:text | font | paper | letter | printing | number | circle | ink | document OCR: Codex Madrid I, II 11 4/s x 8 3/s in. (30 x 22 cm) Madrid, Biblioteca Nacional Once in the collection of Philip V of Spain, the Leonardo manuscripts known as Madrid I and II were transferred to the Biblioteca Nacional in about 1800. They were deemed lost after a researcher requested them in 1898, only to discover that their call numbers corresponded to manuscripts by other writers. Not until 1965 were they relocated among the library's holdings. Madrid I (ca. 1499-1500), 192 folios compiled from other Leonardo manuscripts, contains some of his most detailed and beautiful illustrations of machinery. Madrid II (1491, 1493), a notebook of 17 folios, records his ambitious plans for the casting of his bronze monument to Francesco Sforza, as well as drawings related to diverting the Arno River.