The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 340
^-M^lX-4^!r—^—f-^ f 3 Fig. 1—Ground Plan. … The operator having carefully selected charcoal of a small size andhght weight, proceeds to clear it from dust and sand with a smallmeshed nddle, removing all the heavy pieces of charcoal or stonesthat may be accidentally mixed with it. The raw ore being nextselected and mixed, and being broken…
Architecture · Civil engineering · Science
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