The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 462
durability, isconfidently stated to be indestructible. By the use of the HermeticChimney Valve, the advantage of an open chimney will be combinedwith the facility of effectually closing the flue at pleasure, in caseswhere a downward current of cold air is found to prevail; and thisinvention cannot… … Description of the Drawings,—(a a) are two semi-circular piecesof cast iron, the angular edge (b) of the one being ground and fittedair-tight into the groove (c) on the edge of the otln-r, and the twopieces when together form a circular valve, the circumference of which(D D)is ground into the…
Architecture · Civil engineering · Science
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