Tripod and Stove (dinglu)
Foundations of Internal Alchemy: The Taoist Practice of Neidan, by Wang Mu, page 86
The terms "tripod" and "stove" derive from External Alchemy. They represent the places in which the Golden Elixir is refined. The tripod is in the Palace of the Muddy Pellet (i.e., the upper Cinnabar Field), and the stove is in the lower Cinnabar Field.
In the circulation of the River Chariot, the External Medicine rises to the Muddy Pellet, then descends and coagulates in the "earthenware crucible" (tufu); in other words, it rises along the Control vessel and reaches the top of the head, then descends from the top of the head along the Function vessel and enters the lower Cinnabar Field.
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