Stoneware hot water bottle (foot warmer). It is missing its screw-in stopper, which would also have been stoneware. A fragment of another foot warmer can be seen in the top left of the photograph.
Stoneware foot warmers. These were filled with hot water and used as foot warmers before the invention of the rubber hot water bottle. When rubber bottles came in, people began to discard the stoneware ones. Ginger beer bottles, like the one shown, were also used as...