Théodule Devéria help Mariette read inscriptions in Cairo and its surroundings. He tried to accurately document the archaeological sites using drawings, stampings and photographs. His calotype pictures from this trip are often poor in quality, showing a lack of technical skills. In 1860 he was appointed preserving assistant at the Louvre's Department of Egyptology. He revisited Egypt in 1861–62, traveling up the Nile to Philae at the First Cataract, and into Nubia to the Abu Simbel temples. After returning he helped Mariette prepare descriptions of the excavation in Egypt in 1850–54 for publication. In November 1864 Devéria met the future oriental scholar
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