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They're hand blown in lead glass with petal moulded flutes to the bottom half of the bowl and stand on domed feet with rough pontils beneath.
Both of these glasses are also hand blown from lead glass, the earlier one having a rough pontil, the later example having a ground pontil, as most glasses do by 1830.
Ingles M, Anadon P (1991) Relationship of clay minerals to depositional environment in the non-marine Eocene Pontils Group, SE Ebro Basin (Spain).
Replacing it was the practice of firing pieces on individual tubular stands or firing pontils.
The plate at the bottom of the stack invariably shows evidence inside the footring of having been fired on a ceramic pontil, or tubular support.
In the 1990s the Sunderland firm of Hartley Wood and Co began making new Victorian style dumps, but these can easily be distinguished from 19th century ones by the better quality of the glass, the lack of wear, and the fact that the pontil mark has been polished out.