UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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).
Ophakathi
Two days, plus drying
Imiyalelo
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).
Izinto zokwakha zalesi sinyathelo:
Ubumba Obumelana Nomlilo10 kg
Isihlabathi Esicolekile10 kg
Amanzi8 amalithaAmathuluzi adingekayo:
Ibhakede
Ifosholo Lesandla2
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.
Izinto zokwakha zalesi sinyathelo:
Isitini Esimelana Nomlilo20 izicucu
Induku yensimbi ekhandiwe2 mAmathuluzi adingekayo:
Ifosholo Lesandla
Isilinganiso Sokulingana
Iziko lomkhandi wensimbi
Isando esinekhanda elimise okwesikhonkwane3
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.
Izinto zokwakha zalesi sinyathelo:
Isitini Esimelana Nomlilo40 izicucuAmathuluzi adingekayo:
Ifosholo LesandlaIsilinganiso Sokulingana4
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.
Izinto zokwakha zalesi sinyathelo:
Ipayipi likashimula1 ucezu
Ishidi lensimbi (elikhandiwe)1 ucezuAmathuluzi adingekayo:
Ifosholo Lesandla5
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.
Izinto zokwakha zalesi sinyathelo:
Amalahle10 kgAmathuluzi adingekayo:
Amagilavu Amelana Nokushisa6
6
Draught from the chimney
Draught from the chimney
Ilayisha incwadi ye-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.
Izinto
8- Isibambeli
- Isibambeli
- 8 amalithaIsibambeli
- 40 izicucuIsibambeli
- Isibambeli
- 1 ucezuIsibambeli
- Isibambeli
- 10 kgIsibambeli
Le blueprint yenza
Ama-blueprint ahlobene
Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso
CC0 Isizinda Somphakathi
Le blueprint ikhishwe ngaphansi kwe-CC0. Ukhululekile ukukopisha, ukuguqula, ukusabalalisa, nokusebenzisa ngaphandle kwemvume.
Sekela uMenzi ngokuthenga imikhiqizo nge-Blueprint yabo IKhomishane Yomenzi kumiswe ngabathengisi, noma dala inguqulo entsha yale Blueprint bese uyifaka njengoxhumaniso ku-Blueprint yakho ukuze wabelane ngemali engenayo.