British Museum Department of the Middle East group of stone reliefs from the excavations of Max von Oppenheim at Tell Halaf that was purchased in 1920. More material followed from the excavations of Max Mallowan at Chagar Bazar and Tell Brak in 1935–1938 and from Woolley at Alalakh in the years just before and after the Second World War. Mallowan returned with his wife Agatha Christie to carry out further digs at Nimrud in the postwar period which secured many important artefacts for the museum. The collection of Palestinian material was strengthened by the work of Kathleen Kenyon at Jericho in the 1950s and the acquisition in
Assyria visible, whether the image were viewed frontally or in profile. Although works of precious gems and metals usually do not survive the ravages of time, some fine pieces of Assyrian jewelry were found in royal tombs at Nimrud. There is ongoing discussion among academics over the nature of the Nimrud lens, a piece of quartz unearthed by Austen Henry Layard in 1850, in the Nimrud palace complex in northern Iraq. A small minority believe that it is evidence for the existence of ancient Assyrian telescopes, which could explain the great accuracy of Assyrian astronomy. Other suggestions include its use as