Research From:Te Toi UkuName/TitleBullers ringAbout this objectBullers ring with "30.9 BW b" scratched into the surface. Bullers rings are ceramic temperature control ring devices for use in a kiln or furnace. "BW" stands for Bottom West.Named CollectionJ T Diamond collectionObject TypetoolObject number2016.44.260Copyright LicenceAttribution - Non-commercial (cc)