Before revision: 1269 – Pierre de Maricourt describes magnetic poles and remarks on the nonexistence of isolated magnetic poles 1282 – Al-Ashraf Umar II discusses the properties of magnets and the dry compasses were to find qibla.
After revision: 1269 – Pierre de Maricourt describes magnetic poles and remarks on the nonexistence of isolated magnetic poles 1282 – Al-Ashraf Umar II discusses the properties of magnets and dry compasses in relation to finding qibla.