Dear Tim.
This is all I can find.
From "Iron and Steel" (WH Greenwood revised by AH Sexton. Date not known but
probably around 1900) p 119 in the "Iron" section:-
"In front of the furnace is a space about 40ft by 20ft covered to the depth
of about 1ft. 6in. with a slightly binding sand similar to the moulding sand
used in a foundry ..."
Peter Hutchison
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