Joseph Bonomi the Younger into debt and was eventually happy to accept a modestly paid commission to accompany Robert Hay on an expedition, via Malta, to Egypt in 1824. This began a lifelong interest in Egyptology. From 1824 to 1826, he was a member of Hay's expedition where he sketched many antiquities. At Abu Simbel in 1825, Bonomi – responding to Hay's demands for great accuracy – devised a drawing frame (a viewfinder-type device equipped with a sight and a string or wire grid) to help them draw the temples' interior decorations. The expedition then moved on to Kalabsha, where Bonomi laboured to produce
Abu Simbel temples the small sanctuary represent scenes of offerings to various gods made either by the pharaoh or the queen. On the back wall, which lies to the west along the axis of the temple, there is a niche in which Hathor, as a divine cow, seems to be coming out of the mountain: the goddess is depicted as the Mistress of the temple dedicated to her and to queen Nefertari, who is intimately linked to the goddess. Each temple had its own priest that represents the king in daily religious ceremonies. In theory, the Pharaoh would have been the only celebrant