UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Nichrome Wire: Nickel and Chromium Fused, Drawn and Annealed
Nichrome is the heating wire of toasters and irons. Albert Marsh patented it in 1906: nickel with less than 25 % chromium, drawn into wire and annealed, with about fifty times the resistance of copper and great resistance to oxidation when hot. Iron, he wrote, will not do. Elwood Haynes (1907) fused pure, carbon-free nickel and chromium in a magnesia crucible under an oxyhydrogen flame. White heat: face shield and gloves.
The picture: Marsh's patent drawing, a rheostat wound with the alloy (US 811,859).
Hejuru
3 days
Amabwiriza
1
1
Weigh 85 nickel to 15 chromium
Weigh 85 nickel to 15 chromium
Cut 85 g of nickel sheet into small pieces and weigh 15 g of chromium: Marsh's own example. Both must be pure and free of carbon.
Ibikoresho by'iyi ntambwe:
Urupapuro rwa nikel85 g
Icyuma cya Kromiyumu15 gIbikoresho bikenewe:
Imikasi y'icyuma
Umunzani w'ibiro2
2
Fuse under the oxyhydrogen flame
Fuse under the oxyhydrogen flame
Put the metals in a magnesia crucible, set it in a furnace lined with magnesia, and heat it with the oxyhydrogen blowpipe until both have melted together.
Ibikoresho bikenewe:
Inkono ya Maginezi
Okiside ya magnesiyumu
Umuyoboro Uhuha Okisihidorojeni
Amakoro y'Icyombo Gishongesha
Ingabo y'Isura
Uturindantoki tw'Uruhu3
3
Cast a rod
Cast a rod
Pour the alloy into a narrow mould to get a rod that will start in the largest hole of the drawplate.
Ibikoresho bikenewe:
Imbumbe yo gusukamo icyuma gishongeyeAmakoro y'Icyombo GishongeshaIngabo y'IsuraUturindantoki tw'Uruhu4
4
Draw and anneal
Draw and anneal
Draw the rod down through the drawplate one hole at a time, as in the drawplate blueprint, and anneal it in the furnace whenever it gets hard. Marsh gives no annealing temperature. Stop at 0.41 mm (0.016 in).
Ibikoresho bikenewe:
Urubaho rwo gukurura insinga rw'icyuma
Koleyo yo gukurura insinga
Amavuta yo gukurura insinga
Itanura ry'amakara
MikorometeroUturindantoki tw'Uruhu5
5
Check the resistance
Check the resistance
Measure one metre with the multimeter. Marsh's 15 % wire of this size measured about 2.3 ohms per foot, which is 7.5 ohms per metre.
Ibikoresho bikenewe:
Igipimo cy'amashanyarazi kinyuranyeIbikoresho
2- Umwanya
- Umwanya
Ibikoresho bikenewe
15- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
Blueprint zijyanye
Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
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.