a, sagger or 60 of hard porcelain. When one of theboxes was filled it was first warmed in a special kiln, then itwas put into one end of the firing kiln and passed successivelythrough the four chambers, the heat increasing in each one,until it arrived at the center chamber where the principal… … MUFFLE KILNS. 185 vus noeessiiry to have a great niuoiini of itractice, which re-duced the immber of firemen capabk ol undertaking this re-sr.onsibilitj, to one or two persons. 1 had a trial piece attachedto each box, which could be drawn out, by a tongs through theview hole. When the trial pieces…
Pottery
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