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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.
Kati
Unknown
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
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Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.