Most smelting workshops (Factory) were built in a circular shape, constructed constantly at the higher part of the workshop. It is also noted that when constructing the [smelting] furnace, a shallow hole is dug within the workshop. The furnace is built with clay and the furnace is built 60cm to 70cm in height, and then connected to the furnace base is level with the tuyere (a pipe made of clay) connected from the bellows to the smelting furnace through which air is blown to the furnace using the bellows.
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