Photo shows a man pushing a tray of painted tiles into a kiln. Tiles were part of J. Scott Williams' mural Man's conquest of the elemental forms of nature for the 1939 World's Fair.
Unidentified man working at a kiln, not after 1939 / unidentified photographer. Federal Art Project, Photographic Division collection, circa 1920-1965, bulk 1935-1942. Archives of American Art, Smithsonian Institution.
U.S. public domain
Archives of American Art, Smithsonian Institution Washington, D.C. 20560