This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
An alchemical apparatus entry records a specific, named piece of equipment used in the alchemical work, a furnace, a still, a vessel for sealed heating, considered for its documented physical form and its stated role in a specific alchemical process, distinct from the philosophical or spiritual meaning alchemists attached to that process, which the atlas records under its own separate entries. Lawrence Principe's history of alchemy treats its equipment as real, working laboratory technology, tracing how apparatus such as the alembic and the athanor were actually built and actually used rather than treating them only as symbols.
An entry records an apparatus's documented physical construction, the material process it was built to perform, distillation, sublimation, sustained gentle heat, and where the historical record allows it, which specific alchemical operations it was used for, since the same named piece of apparatus often served more than one operation across different workshops and periods.
Where an apparatus also carried a symbolic or allegorical reading within alchemical texts, the philosophical egg standing for the whole work in miniature, an entry records that symbolic layer honestly alongside its documented physical function, as two separate, both worth recording, facts about the same object.