1. Cotton MS Vitellius A I, ff 21–26 Reference (shelfmark): Cotton MS Vitellius A I, ff 21–26 Title: Tractatus de compositione cylindri (21r–22r: T/K 776, 1536); Tractatus quadrantis (22v–25r: T/K 333); Uersus de algorismo (25v–26r: Walther 7470) Collection Area: Western Manuscripts Languages: Latin Date Range: 2nd half of the 13th century Extent: 1 item