Chemical Furnaces & Vessels — Wecher, 17th-Century French MS

a a. The bain-marie water bath vessel which is made of copper and is completely round.

b b. The lid of this vessel with five pertuis openings through which the necks of the uessies bladders or distillation vessels or courges gourds or cucurbits pass.

c. The canal pipe or channel with its pierced lid and the grate at the bottom.

d d. Another bath made in an oval shape, for two gourds only.