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 summer seldom fall below 20 °C. Winters are mild with highs around 25 °C, when temperatures can sometimes fall below 10 °C at night. Precipitation is so rare here that it is impossible to state a "rainy season" for Abu Simbel. In the past, Abu Simbel was located on the west bank of the Nile between the first and second Cataracts of the Nile. Cataracts are rapids caused by boulders or rock sills; they were only passable with difficulty by Nile ship traffic, especially at baseflow. Today both cataracts near Aswan and Wadi Halfa are covered by Lake Nasser, which