Da'iral al-Mu'addil, with a Depiction of the Ka'bah

The base plate of this instrument, a combined qiblah compass and sndial which is known as the da'irat al-mu'addil, is marked with the names of various cities. It also houses a magnetic compass so that, when aligned on the meridian, it gives the direction of Mecca, represented at the centre of the plate with a depiction of the Ka'bah and Maqam Ibrahim. When correctly oriented, the instrument also functions as a sundial.