Appleton's dictionary of machines, mechanics, engine-work, and engineering . foundation of masonry, which should be well drained, as shown at d. The hearth itself is made of fire-clay, sloping outwards to the lip in order to make a clean run-out. The height of such a cupola is from8 to 10 feet; the tymp, as it may be called, (i. e., the tap,) is 12 by 16 inches high. (This is madelarge purposely, in order to get at the hearth for cleaning it, and, when the cupola is working, is stoppedup.) The tuyere can be varied from 16 to 20 inches above the hearth. The hearth in this figure is repre
Appleton's dictionary of machines, mechanics, engine-work, and engineering . foundation of masonry, which should be well drained, as shown at d. The hearth itself is made of fire-clay, sloping outwards to the lip in order to make a clean run-out. The height of such a cupola is from8 to 10 feet; the tymp, as it may be called, (i. e., the tap,) is 12 by 16 inches high. (This is madelarge purposely, in order to get at the hearth for cleaning it, and, when the cupola is working, is stoppedup.) The tuyere can be varied from 16 to 20 inches above the hearth. The hearth in this figure is represented as very large—the object being to save metal and repairs,rather than fuel. In general, a narrow hearth saves fuel; but it is at the expense of metals oxidatedand in-walls worn. The comparison for ultimate economy must be made in each case ; and the resultwill differ according to the locality. Where fuel is dear, the hearth may be narrowed to advantage. The internal shape of cupolas does not appear to have been much studied, if one may judge fromtheir variety. These rule
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
