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.

Info – … In 1923, Adamsez of Scotswood bought the yard and traded under the name Adams-Pict firebrick Company. Fireclay was brought here from Scotswood and Scotland, to produce PICT a, PICT H, Adams-Pict, and Pict-Inso bricks …

(Note – SBH – I have added the Scottish tag here as although the bricks themselves were manufactured in Northumbria, much of the clay was mined in Scotland)



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