DOI Page / Citation link:
https://doi.org/10.11588/diglit.19574#0033
so A Q^U
vitriol feverai times, over live coals, to caufe it to penetrate
the deeper, and afterwards giving them a glofswith a little foft
wax and a dry cloth.
Aqua-fortis is of various and extenfive ufeto workers in
mofaic, for ftaining and colouring their woods.
There are feveral forts of Aqua-fortisj prepared after diffe-
rent manners, appropriated to the different ufes they are de-
figned for; but all of them always with falt-petre or nitre,
which is the principal ingredient in Aqua-fortis.
This which follows, is one of thofe that has a peculiar com-
pofition.
Take one pound of nitrej or falt-petre refined ; three pounds
of roch allum, calcined on the fire-fhovel; and four ounces of
cryftalline arfenic ; reduce all into a fine powder, to which
add feven ounces of fine fand (but Neri fays lime) and, having
well mixed the whole compofition, put it into a glafs cucurbit,
always leaving one third part of it empty j two thirds being
filled, lute the cucurbit well with a flrong lute^ which is to be
made as follows :
Take one part of loam (a fat earth) which is found in ri-
vers, three parts of fand, of common wood-afhes well fifted,
of the {hearings of woollen cloth, each half a pound; mix the
whole well together, and, putting water to them, make a foft
pafte; to which add one third part of common fait powdered,
and work them all well together, and then ufe them in luting
your veffels.
But, before you put the cucurbit or body on, you muff, lay
fand four inches deep, and thick iron bars, to bear the weight,
then fit a head, and clofe the joints well with a lute made of
fine flour, and lime powdered, and mixed with whites of eggs :
Then put on the joints, rollers of fine linen, then lute it again,
and put on linen rollers again, three or four times, each time
letting it dry before you put on the next roller, and then this
will bear the violence of the fire, and the penetrating force of
the fpirits of the Aqua-fortis.
After that, you muff put this body of the alembic in a deep
earthen pan, made of the fame earth as crucibles, filled with
fand, fo that it be buried in the fand, within two inches of the
joints; then fet it in a wind-furnace, fit and capable to main-
tain an equal fire. See the article FURNACE.
Your alembic being thus fitted, you muff fit to the head a
glafs receiver very capacious, the better to refiff the force of the
fpirits, otherwife all may break.
Lute it well to the mouth of the alembic, as you did the
joints before, and with the fame precaution of letting it dry
each time in the air, taking care not to kindle the fire in the
furnace,
vitriol feverai times, over live coals, to caufe it to penetrate
the deeper, and afterwards giving them a glofswith a little foft
wax and a dry cloth.
Aqua-fortis is of various and extenfive ufeto workers in
mofaic, for ftaining and colouring their woods.
There are feveral forts of Aqua-fortisj prepared after diffe-
rent manners, appropriated to the different ufes they are de-
figned for; but all of them always with falt-petre or nitre,
which is the principal ingredient in Aqua-fortis.
This which follows, is one of thofe that has a peculiar com-
pofition.
Take one pound of nitrej or falt-petre refined ; three pounds
of roch allum, calcined on the fire-fhovel; and four ounces of
cryftalline arfenic ; reduce all into a fine powder, to which
add feven ounces of fine fand (but Neri fays lime) and, having
well mixed the whole compofition, put it into a glafs cucurbit,
always leaving one third part of it empty j two thirds being
filled, lute the cucurbit well with a flrong lute^ which is to be
made as follows :
Take one part of loam (a fat earth) which is found in ri-
vers, three parts of fand, of common wood-afhes well fifted,
of the {hearings of woollen cloth, each half a pound; mix the
whole well together, and, putting water to them, make a foft
pafte; to which add one third part of common fait powdered,
and work them all well together, and then ufe them in luting
your veffels.
But, before you put the cucurbit or body on, you muff, lay
fand four inches deep, and thick iron bars, to bear the weight,
then fit a head, and clofe the joints well with a lute made of
fine flour, and lime powdered, and mixed with whites of eggs :
Then put on the joints, rollers of fine linen, then lute it again,
and put on linen rollers again, three or four times, each time
letting it dry before you put on the next roller, and then this
will bear the violence of the fire, and the penetrating force of
the fpirits of the Aqua-fortis.
After that, you muff put this body of the alembic in a deep
earthen pan, made of the fame earth as crucibles, filled with
fand, fo that it be buried in the fand, within two inches of the
joints; then fet it in a wind-furnace, fit and capable to main-
tain an equal fire. See the article FURNACE.
Your alembic being thus fitted, you muff fit to the head a
glafs receiver very capacious, the better to refiff the force of the
fpirits, otherwife all may break.
Lute it well to the mouth of the alembic, as you did the
joints before, and with the fame precaution of letting it dry
each time in the air, taking care not to kindle the fire in the
furnace,