Fig. 5. Two Stills at work in one Refrigeratory; a, b the two Still Heads, c, d the Bodies inclosed in the Brick-Work; e, e the two Fire-Places; f, f the two Ash-Holes; g a Common Receiver; h a Spout Receiver, called by Chemists a Separating-Glass, used in the Distillation of Herbs, in order to extract their essential Oil; i a Crane for drawing the Water out of the Refrigeratory.
Fig. 6. A small Still with a Refrigeratory; a the Body, b the Head, c the Refrigeratory filled with Water, d the Receiver, luted to the Bec of the Alembic.
Fig. 7. A Glass Alembic to be used as a Balneum Mariæ; a the Body, b the Head, c the Bec, which is to be luted to the Receiver, d a Trivet on which it is standing in the Water.
Fig. 8. A proper Receiver for the Glass Alembic, called by Chemists a Bolt-Head, or Matrass.
Fig. 9. The Glass Alembic placed in a Copper Vessel; a the Copper Vessel filled with Water, b the Body of the Glass Alembic, c the Head, d the Receiver luted at c to the Bec of the Alembic.
Fig. 10. A cold Still for distilling simple Waters; a the Head, b the Bec, or Nose, c the Receiver, d the Plate on which Herbs are laid.
Fig. 11. A Vessel for Digestion, called by Chemists a Pelican or circulatory Vessel; a the Body, b the Head, c, c two Tubes, luted at d, d, by which the Liquor returns from the Head into the Body; e a Furnace on which it is placed, f the Fire-place, g the Ash-hole.
Fig. 12. Another Receiver, used when it is necessary to lute it to the End of the Worm, in order to prevent the most volatile Parts from being evaporated, and lost.
CHAP. VI.
Of the Accidents that too often happen in performing the Processes of Distillation.
Among the Accidents which frequently happen in Distilling, the least of all is for the Operation to miscarry and the Ingredients to be lost.