Heat retentive double walled drinking vessel - has inner and outer ceramic vessels with glazed seal at upper rim

摘要

A heat retaining cup, mug or jug consists of an inner and an outer vessel with an air gap or chamber between. Both the inner and outer vessels are made from ceramic material. - The upper edge of the inner vessel is chamfered and supports the funnel shaped outside face of the inner vessel, ready for firing. Both these vessels are connected or sealed together by glazing material to form a good joint.