UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Plumbago Crucibles: Fire Clay, Coke and Graphite, Ure 1839
No machine-readable author provided. Skatebiker assumed (based on copyright claims). (Wikimedia Commons) · Public domain
Mary

Yaremwe na

Mary

14. Ukwakira 2026FI
16
0
0
0
0

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.
Hejuru
A week with drying

Amabwiriza

1

Grind and sift

Pound the coke and the plumbago fine and sift them; sift the grog.

Ibikoresho by'iyi ntambwe:

Amakara y'ubutareAmakara y'ubutare1 kg
Garafite karemanoGarafite karemano1 kg
Grogi (ibumba ryokejwe ryasyanyijwe)Grogi (ibumba ryokejwe ryasyanyijwe)0.5 kg

Ibikoresho bikenewe:

Isekuru n'UmuhiniIsekuru n'Umuhini
Akayunguruzo Gafite Urukoma RutoAkayunguruzo Gafite Urukoma Ruto
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
2

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.

Ibikoresho by'iyi ntambwe:

Ibumba ryihanganira umuriroIbumba ryihanganira umuriro2 kg
AmaziAmazi1 litiro

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
IndoboIndobo
3

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.

Ibikoresho bikenewe:

Inyundo y'IgitiInyundo y'Igiti
Icyuma gikata cy'akaziIcyuma gikata cy'akazi
4

Dry slowly

Dry them slowly in a warm room for several days, turning them now and then, until no moisture is left.

Ibikoresho bikenewe:

Igitanda cyo kumishirizaIgitanda cyo kumishiriza
5

Fire

Bake them in the kiln, raising the heat slowly. Store them dry and warm each before first use.

Ibikoresho bikenewe:

Itanura ry'ubushyuhe bwinshiItanura ry'ubushyuhe bwinshi
6

Ure's Berlin mix

Gupakira ikaye ya Jupyter…

Ibikoresho

5

Ibikoresho bikenewe

9

Iki gishushanyo gikora

Thumbnail
Agateganyo

Akabindi ka garafite n'ibumba

Free

202
0
1

Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

Hard Porcelain Body: Kaolin, Felspar, Flint and Chalk, the Sèvres Paste

Hard Porcelain Body: Kaolin, Felspar, Flint and Chalk, the Sèvres Paste

na MaryFI

Amabumba n'Ibumba

20
0
0
0
0
0

CC0 Umurenge rusange

Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.

Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.

Ibiganiro

(0)

Injira kugira ngo ujye mu biganiro

Gutegura ibitekerezo...