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UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Akaga
Muffle Furnace: Electric, a Talc Tube Wound with Resistance Wire in a Plug-In Housing (Marsh, US 861,744, 1907)
A small electric muffle furnace from the man who invented nichrome. A talc tube wound with resistance wire, packed in silica inside a fire-clay shell, makes the heated chamber (the muffle). It slides into a metal housing on a post, and a plug-in head both feeds it current and locks it in place. The door drops flat to serve as a shelf.
Result: a bench furnace that plugs into a lamp socket, with a muffle that can be pulled out and changed in moments.
Source: A. L. Marsh (Hoskins Co.), US 861,744 (1907). Unknown: sizes, current and temperatures, and several materials. Asbestos fibre in the door and end disks: hazardous. Picture: the patent drawing.
Hagati
Unknown
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