IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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).
Àárín
Two days, plus drying
Ìlànà
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).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Amọ̀ Tí Ń Fara Da Iná10 kg
Iyanrìn Kékeré10 kg
Omi8 lítàÀwọn irinṣẹ́ tí a nílò:
Bàkẹ́ẹ̀tì
Ọkọ́ Ọwọ́2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bíríkì Tí Ń Kojú Iná20 ẹyọ
Ọ̀pá róbótó irin lílù2 mÀwọn irinṣẹ́ tí a nílò:
Ọkọ́ Ọwọ́
Ìwọ̀n Ìtẹ́jú
Ìléru alágbẹ̀dẹ
Òòlù olórí ìtẹ̀ ìpakà3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bíríkì Tí Ń Kojú Iná40 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ọkọ́ Ọwọ́Ìwọ̀n Ìtẹ́jú4
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Páìpù èéfín1 ẹyọ
Pẹpẹ irin (tí a lù)1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ọkọ́ Ọwọ́5
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Èédú10 kgÀwọn irinṣẹ́ tí a nílò:
Ìbọ̀wọ́ Tí Ń Fara Da Ooru6
6
Draught from the chimney
Draught from the chimney
Ń ṣí ìwé Jupyter…
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.
Àwọn ohun-èlò
8- Àyè
- 10 kgÀyè
- 8 lítàÀyè
- 40 ẹyọÀyè
- Àyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 10 kgÀyè
Ìtọ́nisọ́nà yìí ń ṣe
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