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Plumbago Crucibles: Fire Clay, Coke and Graphite, Ure 1839
Crucibles must stand sudden heating and cooling without cracking. Andrew Ure (1839) gives the best as pure fire clay with ground old crucibles, black lead (graphite) and some coke: a Berlin mix of 8 parts clay and cement, 5 of coke and 4 of graphite stood 23 meltings of 76 lb of iron each. Mix it like a pottery body, press it into crucibles, dry them slowly and fire them.
The picture: used graphite crucibles.
高级
A week with drying
说明
1
1
Grind and sift
Grind and sift
Pound the coke and the plumbago fine and sift them; sift the grog.
此步骤所需材料：
冶金焦炭1 公斤
天然石墨1 公斤
熟料（碎烧结陶片）0.5 公斤所需工具：
研钵与研杵
细目筛
防尘口罩2
2
Mix the body
Mix the body
Measure by bulk 8 parts fire clay with grog, 5 parts coke and 4 parts graphite (Ure's Berlin mix). Mix dry, then add water and knead to a stiff dough as for pottery.
此步骤所需材料：
耐火黏土2 公斤
水1 升所需工具：
等臂天平
水桶3
3
Form the crucibles
Form the crucibles
Press the dough hard into a mould round a wooden former, or over a tapered former, keeping the walls even and not too thick; ease each crucible off and trim the rim.
所需工具：
木槌
美工刀4
4
Dry slowly
Dry slowly
Dry them slowly in a warm room for several days, turning them now and then, until no moisture is left.
所需工具：
晾干架5
5
Fire
Fire
Bake them in the kiln, raising the heat slowly. Store them dry and warm each before first use.
所需工具：
高温窑6
6
Ure's Berlin mix
Ure's Berlin mix
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