Anonymous treatise on the construction and use of the linear astrolabe (أسطرلاب خطّي), an instrument also known as 'al-Ṭūsī's Rod' (عصا الطوسي), named after its inventor Sharaf al-Dīn al-Muẓaffar ibn Muḥammad al-Ṭūsī (شرف الدين المظفر بن محمد الطوسي; d. 1213). The Persian table of contents (f. 1r) c...
