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extending through the subterranean area of the Glass-house,
connected with the open air at each end, under the bars of the furnace,
receive the fallen cinders, and supply the oxygen necessary for the
combustion of the fuel. At right angles with the large cave, are smaller
caves, communicating so as to catch the wind from as many aspects as
possible.
Ground plan of the siege flues and fire-place of the furnace, with nine large pots and three small, in their respective positions.
The coals are shovelled through the square
hole (A), on to the grate, in the centre of the furnace
(B); two strong iron sleepers support the bars, which
are prevented from melting, by being previously covered with a layer
of clinkers, potsherds, or broken Welsh lumps; but as the furnace,
in process
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