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Crucible Furnace: the Brass Founder's Sunk Coke Air Furnace (Larkin, 1907)
The brass founder's crucible furnace: a firebrick-lined pit sunk below the floor, fired with hard coke on an iron grating over the ash-pit, closed by a dome-shaped iron cover and drawn by a flue with a damper. The crucible sits on a firebrick in the middle of the fire, lidded, with coke banked round it, until the metal is melted.
Result: a coke-fired crucible furnace for melting brass and bronze.
Source: J. Larkin, The Practical Brass and Iron Founder's Guide (1907), pp. 96-99. Unknown: all sizes. Picture drawn by Youblob.
Intermediate
Unknown
Instructions
1
1
Build the pit
Build the pit
Sink the furnace below the floor. Line the inside with firebricks set in fireclay; use pure clay (white, opaque, oily to the touch), since iron oxide, magnesia, lime or black lead in brick or clay shortens the furnace's life. Close the ash-pit at the bottom with a hinged iron grating. Not given: sizes.
Materials for this step:
Firebricks1 lining
Refractory Clay1 jointing
Unknown Metal1 hinged gratingTools needed:
Unknown Dimensions2
2
Fit the cover and flue
Fit the cover and flue
Make a dome-shaped cover for the furnace top of cast or wrought iron. Lead a flue from the furnace with a damper in it. Not given: the flue size or height.
Materials for this step:
Unknown Metal1 dome cover, damper
Chimney Flue Pipe1 flueTools needed:
Unknown Dimensions3
3
Fire it and melt
Fire it and melt
Burn hard coke broken to lumps the size of a fist. Heat the crucible bottom upwards in the fire, lift it out with the tongs, turn it upright and bed it on a slab of fireclay or a firebrick, put on its lid and bank the fire round it. Put the metal in, close the cover and open the damper for draught until the metal is melted. Black-lead crucibles last longer; clay ones must first be hardened by slowly raising their temperature.
Tools needed:
Metallurgical Coke
Graphite Crucible
Crucible TongsMaterials
4- 1 liningPlaceholder
- 1 jointingPlaceholder
- 1 dome cover, damperPlaceholder
- 1 fluePlaceholder
Tools Required
4- Placeholder
- Placeholder
- Placeholder
- Placeholder
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