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Fine Clay Mixed with Sand: Worked Loam for Casting Moulds
Clay mixed with sand is loam, the stuff of bricks and of the clay mould packed round a wax model for casting. Soak the clay, work in fine sand, pick out every stone, and keep working it: the more it is worked, the denser and more uniform it gets.
The picture: our diagram, clay and sand worked together and the stones picked out.
初学者
2 hours plus a night's soak
说明
1
1
Soak the clay
Soak the clay
Break the clay into lumps, put it in the trough, cover with water and leave it overnight to soften.
此步骤所需材料：
黏土1 公斤所需工具：
平头锹
拌料槽
水桶
水2
2
Work in the sand
Work in the sand
Pour off spare water. Add fine sand, about one part to two of clay, and knead or tread it in until no streaks show.
此步骤所需材料：
细砂0.5 公斤所需工具：
拌料槽平头锹3
3
Pick out the stones
Pick out the stones
Cut the mass in slices and pick out every stone, root and hard lump. Knead again; the more it is worked, the denser and more uniform it becomes.
所需工具：
拌料槽4
4
Keep it damp
Keep it damp
Wrap the loam under a tarp to keep it workable until you build the mould.
所需工具：
篷布5
5
Your mix
Your mix
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