. De re metallica. Metallurgy; Mineral industries. 358 BOOK IX. this vent slopes upward, and sooner or later penetrates through to the other side of the wall, against which the furnace is built. At the end of this vent there is an opening where the steam, into which the water has been converted, is exhausted through a copper or iron tube or pipe. This method of making the tank and the vent is much the best. Another kind has a similar vent but a different tank, for it does not lie transversely under the forehearth, but lengthwise ; it is two feet and a palm long, and a foot and three palms wide
. De re metallica. Metallurgy; Mineral industries. 358 BOOK IX. this vent slopes upward, and sooner or later penetrates through to the other side of the wall, against which the furnace is built. At the end of this vent there is an opening where the steam, into which the water has been converted, is exhausted through a copper or iron tube or pipe. This method of making the tank and the vent is much the best. Another kind has a similar vent but a different tank, for it does not lie transversely under the forehearth, but lengthwise ; it is two feet and a palm long, and a foot and three palms wide, and a foot and a palm deep. This method of making tanks is not condemned by us, as is the construction of those tanks without a vent ; the latter, which have no opening into the air through which the vapour may discharge freely, are indeed to be A—Furnaces. B—Forehearth. C—Door. D—Water tank. E—Stone which COVERS IT. F—Material of the vent walls. G—Stone which covers it. H—Pipe exhaling the vapour. Fifteen feet behind the second wall is constructed the first wall, thirteen feet high. In both of these are fixed roof beams*, which are a foot wide and *The paucity of terms in Latin for describing structural members, and the consequent repetition of " beam " (irabs), " timber " {tignum), " billet " (tigilhim), " pole " (asser), with such modifications as small, large, and transverse, and with long explanatory clauses showing their location, renders the original very difficult to follow. We have, therefore, introduced such terms as " posts," " tie-beams," " sweeps," " levers," " rafters," " sUls," " moulding," " braces," " cleats," " supports," etc., as the context Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and app
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