Inso
— 30/04/2014Found 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…
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