Dar maʻrifat-i asṭurlābدر معرفت أسطرلابṬūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274طوسي، ناصر الدين محمد بن محمد، 1201-127416--?]perManuscript.Persian.Also known as Risālah-i bīst bāb dar maʻrifat-i asṭurlāb.Copied ca. 11 cent. H./17 cent. CE. in medium size taʻlīq. The 15 folios measure 13x21.5 cm; the written surface measuring 10x19 cm. is ruled with red lines; 21 lines per page; marginalia; red catchwords and headings on bottom of page; simple drawings; laid paper is light brown and glazed; the leather binding without flap is blind stamped. Ref. GAL I, 512 #48. Provenance: Cushing Persian Ms. 13/2.Preceded by 6 folios of anatomical drawings with few persian labels. Provenance: Cushing: Persian Ms. 13/1.