Now that worked I’ll try these.The Milners plate is the only one I have ever seen.The wording in the top of the milners chest says.
Milners Patent Double Fire resisting Chambers
By the mutual reaction of nonconduction and evaporation
Keep their contents under 212 deg the boiling point in red heat beyond the duration of casual fire
Liverpool Improved For The General Registry 1845.
So that explaines the 212 that is on most of their name plates
