Figure 29 Bowls, William Rogers, Yorktown, Virginia, 1720–1745. Biscuit earthenware. H. 5". (Courtesy, National Park Service, Colonial National Historical Park, Yorktown Collection.) COLO Y 71193, COLO Y 71188. Bowls had up to ten variations in rim style and five basal types. Earthenware forms were fired twice, first to biscuit and then glazed and fired again.