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His description left no doubt among some historians that he was describing projectiles containing gunpowder.In their history of rockets published on the internet NASA says “the Arabs adopted the rocket into their own arms inventory and, during the Seventh Crusade, used them against the French Army of King Louis IX “ e.Place this jar on a low fire until the contents begin to coagulate.
He has authored and edited many books on Fatimid history and the formative period of Ismaili thought including Early Philosophical Shi'ism (Cambridge University Press, 1993), The Wellsprings of Wisdom: A Study of Abu Yaqub al-Sijistani's Kitab...We shall revisit some Arabic sources that were known and repeatedly discussed since the middle of the nineteenth century, and shall add few more manuscripts and sources that were not discussed before. It was known under various names, was used as a flux in metallurgical operations and for producing nitric acid and aqua regia.We shall analyse gunpowder composition for rockets and cannon as they are given in these manuscripts, and shall discuss briefly the development of cannon in the thirteenth and fourteenth centuries in the Mamluk Kingdom and in Muslim Spain. it was shown that Arabic alchemists knew potassium nitrate since the start of Arabic alchemy at the time of Khalid ibn Yazid (d. Recipes for these uses are found in the works of Jabir ibn Hayyan (Geber, d.Beware of sparks”In this method calcium salts are removed by adding potassium carbonate in the form of wood ashes.Thus calcium carbonates are precipitated and can be removed leaving the chemically equivalent amount of potassium nitrate in solution.
Al-Rammah (d 695 AH/1295 AD) deals extensively in his book with gunpowder and its uses .