What Gwynplaine saw was a torture chamber.
There were many such in England.
The crypt of Beauchamp, Tower Long, served this purpose.
As did also the cell in Lawlord's Prison.
A place of this nature still to be seen in London called the Vaults of Lady Place.
In this last-mentioned chamber, there is a grate for the purpose of heating the irons.
All the prisons of King John's time, and Southwark Jail was one, had their chambers of torture.
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