A—FURNACE. B—ITS ROUND HOLE. C—AIR-HOLES. D—MOUTH OF
THE FURNACE.
E—DRAUGHT OPENING UNDER IT. F—EARTHENWARE CRUCIBLE. G—AMPULLA.
H—OPERCULUM. I—ITS SPOUT. K—OTHER AMPULLA. L—BASKET IN WHICH THIS IS
USUALLY PLACED LEST IT SHOULD BE BROKEN.
E—DRAUGHT OPENING UNDER IT. F—EARTHENWARE CRUCIBLE. G—AMPULLA.
H—OPERCULUM. I—ITS SPOUT. K—OTHER AMPULLA. L—BASKET IN WHICH THIS IS
USUALLY PLACED LEST IT SHOULD BE BROKEN.
All this preparation having been accomplished in order, and the
ingredients placed in the ampulla, they are gradually heated over burning
charcoal until they begin to exhale vapour and the ampulla is seen to trickle
with moisture. But when this, on account of the rising of the vapour, turns
red, and the aqua distils through the spout of the operculum, then one must
work with the utmost care, lest the drops should fall at a quicker rate than
one for every five movements of the clock or the striking of its bell, and
not slower than one for every ten; for if it falls faster the glasses will be
broken, and if it drops more slowly the work begun cannot be completed
within the definite time, that is within the space of twenty-four hours. To
prevent the first accident, part of the coals are extracted by means of an iron
implement similar to pincers; and in order to prevent the second happening,
small dry pieces of oak are placed upon the coals, and the substances in the
ampulla are heated with a sharper fire, and the air-holes on the furnace
are re-opened if need arise. As soon as the drops are being distilled,
the glass ampulla which receives them is covered with a piece of linen
ingredients placed in the ampulla, they are gradually heated over burning
charcoal until they begin to exhale vapour and the ampulla is seen to trickle
with moisture. But when this, on account of the rising of the vapour, turns
red, and the aqua distils through the spout of the operculum, then one must
work with the utmost care, lest the drops should fall at a quicker rate than
one for every five movements of the clock or the striking of its bell, and
not slower than one for every ten; for if it falls faster the glasses will be
broken, and if it drops more slowly the work begun cannot be completed
within the definite time, that is within the space of twenty-four hours. To
prevent the first accident, part of the coals are extracted by means of an iron
implement similar to pincers; and in order to prevent the second happening,
small dry pieces of oak are placed upon the coals, and the substances in the
ampulla are heated with a sharper fire, and the air-holes on the furnace
are re-opened if need arise. As soon as the drops are being distilled,
the glass ampulla which receives them is covered with a piece of linen