i 
for the Smelting of Fron with Anthracite. 17 
before running over the dam-stone (d) atc, where the cinder will 
escape first, being the lightest, whilst the smelted iron occupies 
the bottom. 'T'o prevent the fluid matter from being forced out by 
the blast, clay is. ied beneath the temp, around the twiers, and 
4 upon the surface, at h, where it is retained by heavy iron plates, 
_ which are raised every few hours, to allow the cinder to run off 
bottoth of the dam-stone. The -stone is de- 
f in front by a large iron dam-plate (de, fig. 1) against which 
i, the dust-plate ¢, 7, rests. The lower edge of the latter rests ° 
upon the ground, which is raised to about the level of the bottom 
of the hearth d, Ge a oye ; > 
, Fig. 2. 
