The use of X-ray radiography in the study of paintings and other museum objects is discussed. X-ray radiography of several museum objects provided new, useful information as follows: a ceramic bowl is composed of unrelated fragments and plaster; there is a clay core in a bronze figurine from about 2500 BC; and the famous Bronze Horse was cast by the lost wax process and not, as had been suggested, by a modern piece-mold sand casting process. In addition, X-ray radiography helped to provide details on the methods of manufacturer of Sasanian Ag and a Chinese bronze vessel. See also AATA 16-1172.