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Charcoal Air Furnace for Crucibles, Drawn by a Chimney
The chemist's furnace for melting in crucibles needs no bellows: a firebrick box closed on every side, air entering only under the grate, and a tall chimney to draw it through the burning charcoal. George Fownes (1856) describes it; a sliding damper in the flue sets the heat, from dull red upward.
The picture: a 16th-century assay workshop woodcut with wind furnaces, one on a tripod, for melting silver in crucibles (Deutsche Fotothek).
中级
Two days, plus drying
说明
1
1
Fireclay mortar
Fireclay mortar
Mix fireclay and fine sand with water to a stiff, smooth mortar (our mix: about one part clay to one of sand).
此步骤所需材料：
耐火黏土10 公斤
细砂10 公斤
水8 升所需工具：
水桶
手铲2
2
Ash pit and grate
Ash pit and grate
Lay a level firebrick base and build a low ash pit with an opening at the front. Forge bars from wrought iron rod and set them across the top as the grate, a finger's width apart.
此步骤所需材料：
耐火砖20 个
熟铁圆棒2 m所需工具：
手铲
水平尺
铁匠炉
横向楔头锤3
3
Fire box
Fire box
Build a square box of firebricks on the grate, wide enough for a crucible with a hand's width of charcoal all round, and tall enough to cover it. Joint every brick thinly with the fireclay mortar.
此步骤所需材料：
耐火砖40 个所需工具：
手铲水平尺4
4
Flue, chimney and damper
Flue, chimney and damper
Lead a flue out near the top into a tall chimney pipe. Fit an iron sliding plate across the flue as a damper. Close the top with a loose firebrick lid.
此步骤所需材料：
烟囱烟道管1 个
铁板（锻打）1 个所需工具：
手铲5
5
Dry and first fire
Dry and first fire
Let the mortar dry for days, then light a small charcoal fire and raise it slowly over an hour or two so the joints do not crack.
此步骤所需材料：
木炭10 公斤所需工具：
耐热手套6
6
Draught from the chimney
Draught from the chimney
正在加载 Jupyter 笔记本…
7
7
Limits
Limits
The principle and the damper are Fownes's; the sizes, the mortar mix and the draught formula's working figures are ours. Charcoal fires make carbon monoxide: work outdoors or under a good chimney.
材料
8- 10 公斤占位符
- 10 公斤占位符
- 8 升占位符
- 40 个占位符
- 2 m占位符
- 1 个占位符
- 1 个占位符
- 10 公斤占位符
CC0 公共领域
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