Found Newcastle upon Tyne.

Produced at the Adams-Pict Firebrick Works at Swalwell, (the site of the earlier Ramsay works on the River Derwent, a tributary of the Tyne and some three miles west of Gateshead), these (INSO) insulating bricks were produced from a mixture of clay, sawdust and diatomite, (a soft, siliceous, sedimentary rock, easily crumbled to form a fine powder), and intended to form a secondary, heat-retaining layer behind the actual firebrick.

I have added the Scottish tag here as although the bricks themselves were manufactured in Northumbria, the clay was mined in Scotland.



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