WITNESS

Ṣinʿat al-rubʿ al-sāʿāt_Istanbul_Süleymaniye Manuscript Library_Ayasofya_4830

References

Charette, François. 2003. Mathematical Instrumentation In Fourteenth-Century Egypt And Syria: The Illustrated Treatise Of Najm Al-Dīn Al-Mīṣrī. Leiden; Boston: E. J. Brill.

P. 108, text 10.