as possible throughout its length, and able, and which may be utilizcd for many purposes. its descent the nearer it approaches the tuyeres, and becomes should be as smooth as possible inside, to avoid friction. As completely desiccated and combustible when it reaches the The upper section or cone… … running day and night con- ber of square inches than the tinuously for days, months, or square of the flue, and never years, if desired; but if it larger, as no more air should becomes necessary to stop at any time, the tuyere pipes of boiler iron, and lined with fire brick resting upon an iron be…
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