. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. are joined together and fixed by wedges, to prevent them from starting asunder. Veryfrequently, indeed, the reverberatory furnaces are armed with cast-iron plates over theirwhole surface. These are retained by upright bars of cast iron applied to the side walls,and by horieontal bars of iron, placed across the arch or roof. The furnace itself isdivided interiorly into three parts ; the fire-place, the hearth, and the_^w<;. The fire-placevaries from 3| to 4^ feet long, by from 2 f
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. are joined together and fixed by wedges, to prevent them from starting asunder. Veryfrequently, indeed, the reverberatory furnaces are armed with cast-iron plates over theirwhole surface. These are retained by upright bars of cast iron applied to the side walls,and by horieontal bars of iron, placed across the arch or roof. The furnace itself isdivided interiorly into three parts ; the fire-place, the hearth, and the_^w<;. The fire-placevaries from 3| to 4^ feet long, by from 2 feet 8 inches to 3 feet 4 inches wide. The doorway by which the coke is charged, is 8 inches square, and is bevelled off towards the out-side of^ the furnace. This opening consists entirely of cast iron, and has a quantity ofcoal gathered round it. The bars of the fire grate are moveable, to admit of more readilyclearing them from ashes. Fig. 593 is a longitudinal section referring to the elevation; fig. 592, and fig. 594, 594. liF^ IS a ground plan. When the furnace is a single one, a squarethe fire-place opposite to the door, through which the rakes areheated. a is the fire door ; b, the grate ; c, the fire bridge ; d d, cast-upon cast-iron beams e c, which are bolted upon both sidesplates of the furnace. / is the hearth covered with cindersv/orking door, which may be opened and shut by means ofmove it up and down. In this large door there is a holewhich the iron may be worked with the paddles or rakes; hole is left in the side ofintixjduced, in order to be •iron hearth plates, restingto the cast-iron bindingor sand; g, is the maina lever g, and chain to5 inches square, throughit may also be closed air- 708 IRON.
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
