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The burner will now prepare the furnace. He will place a grid in the bottom of the furnace and put some stones on top of it to allow the air to penetrate freely and avoid the stuffing of the grid by the ashes.

He will now connect the pump in order the blow actively some oxygen. This is the only way to reach high temperatures with such basic equipment...

Then it's time to initiate the combustion with the furnace 75% full of charcoal. And you must tamp it to make sure it won't move too much during the combustion.

The air is very hot, dry and dusty.

The crucibles are placed on top of the furnace the heat is blown from the bottom and reaches the highest temperature.

And you may be quite surprised to notice that most of the crucibles are place over the limit of the furnace which is extended with bricks.

 

 

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