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FORGE FOR HARD COAL. In working hard, or anthracite coal, no
horizontal tuyere, nor any of the description above referred to,
can be used to advantage. A small grate is laid in the bottom of
the fire-hearth, space being left below it for the reception of
ashes and clinkers; the blast is then introduced under the grate.
Such an arrangement may he made at any common forge-fire; but a
more perfect forge is represented in Fig. 5. This is a brick
hearth, about rig 5 thirty inches high and three feet square, in
the centre of which is a square pit, into which the blast-pipe is
conducted. At a distance of six inches, or less, below the top of
the brick-work, a cast-iron plate is inserted, in which is a square
hole for the reception of the grate. A common stove-grate, four or
five inches square, and fitting loosely into the cast-iron plate,
is the kind generally used. A small opening, below the grate, leads
into the ash-pit, in order to carry off the ashes and cinders. On
the right and left of the fire, a wall of fire brick is erected,
six inches inheight, which support an arch, also of fire-brick.
'This arch is movable, and consists of an iron frame, into which
the fire-brick are firmly wedged. In the wall on the right hand is
an opening, into which an iron trough, in the form of a hopper, is
inserted, for the purpose of heating the coal before it is put on
the fire. Fresh hard coal, when thrown suddenly on a hot fire, is
liable to crumble into small pieces; the heating prevents this, and
keeps the fire open, and free from fine coal. The top of the
hearth, or brick- pile, is covered by an iron plate. A fire of this
kind is very advantageous for common smith-work; but a concentrated
heat cannot be made in it. The fi...
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