@RedEx1 I wonder, was they any big advance in making pots, alongside steel, when we managed to make to build much higher temp furnaces? Say around 1750 in the UK.

@SteelFolk Hm. Tricky. there was a lot of advances in pottery in the UK in the 18th C but I'm not sure how many of them were related to kiln technology. The obvious one would be porcelain which was finally first made here about then which require a very high firing temperature, but IIRC it was finding the right clays that held people back rather than being able to achieve the rights temp. I't's getting a bit late for my expertise though so others may know better than me.

@RedEx1 Thanks. From what I can tell the pot crucibles for melting metal didn't spin off into better cookware but then cast iron stuff probably did the job by then.