DOI Page / Citation link:
https://doi.org/10.11588/diglit.19574#0018
6
ALU
The Englifh make ufe of it for both, and call the afhes kelp.
ALEXANDER ALGARDI, a fculptor of Bologna, marked
with the mark N°. 11, in a conclufion engraven by Francis du
Poylli, in 1653; but at other times made ufe of the fame
mark, but without the G.
ANTONIO ALLEGRI DA CORREGGIO, born in
the year 1494, difciple of Frari di Modena, lived in Lombardy,
excelled in hiftory-painting, died in the year 1534, aged forty
years.
ALUM, a peculiar kind of fait, feparated by art from va?
rious fubftances. In Italy it is obtained from a foft reddifh
flone ; about Puteoli, from feveral kinds of earth, and, in Eng-
land, from a whitifh or bluifh ftone, called Irifh flate.
In fome parts of the world, Alum is found pure; having
been wafhed from its ore by water, and afterwards, on the eva-
poration of the water, left in a drv form.
Procefs of making Alum at Whitby in York/hire. Alum is
made thus: Having burnt a quantity of the ore with whins or
wood, till it becomes white; they then barrow it in a pit,
where it is fleeped in water, for eight or ten hours. This li-
quor, or lixivium, is conveyed by troughs to the Alum-houfe,
into cifterns; and from them into the pans, where it is boiled
about twenty-four hours. Then add a certain quantity of the
lee of kelp ; the whole is drawn off into a fettler, where having
remained about an hour, that the fulphur and other dregs may
have time to fettle to the bottom, it is conveyed into coolers :
This done, to every ton of the liquor they add about eight gal-
lons of urine ; and having flood four days and nights, till quite
cool, the Alum begins to cryftallife on the fides of the vefTel,
from which being fcraped off, it is wafhed with fair water, and
then thrown into a bin, to let the water drain off; after this
it is thrown into a pan, called the rocking pan, and there melt-
ed, in which flate it is conveyed by troughs into tuns, where
it flands about ten days, till perfectly condenfed ; then, flaving
the tuns, the Alum is taken out chipped, and carried to the
florehoules. This is what we commonly call roche, or rock
Alum, as being prepared from flones cut from the rocks of the
quarry, and ftands contradiftinguifhed from the common Alum,
or that prepared from the earth.
ALUM Water ; boil four ounces of Allum in a quart of
rain or river water, till the Allum is diffolved, and let it ftand
twenty-four hours.
With this water wafh the prints you defign to colour, and
it will fix the paper fo, that the colours will not fink or run in *
it, when you lay them on, and will help, likewife, to brighten
your colours.
If
ALU
The Englifh make ufe of it for both, and call the afhes kelp.
ALEXANDER ALGARDI, a fculptor of Bologna, marked
with the mark N°. 11, in a conclufion engraven by Francis du
Poylli, in 1653; but at other times made ufe of the fame
mark, but without the G.
ANTONIO ALLEGRI DA CORREGGIO, born in
the year 1494, difciple of Frari di Modena, lived in Lombardy,
excelled in hiftory-painting, died in the year 1534, aged forty
years.
ALUM, a peculiar kind of fait, feparated by art from va?
rious fubftances. In Italy it is obtained from a foft reddifh
flone ; about Puteoli, from feveral kinds of earth, and, in Eng-
land, from a whitifh or bluifh ftone, called Irifh flate.
In fome parts of the world, Alum is found pure; having
been wafhed from its ore by water, and afterwards, on the eva-
poration of the water, left in a drv form.
Procefs of making Alum at Whitby in York/hire. Alum is
made thus: Having burnt a quantity of the ore with whins or
wood, till it becomes white; they then barrow it in a pit,
where it is fleeped in water, for eight or ten hours. This li-
quor, or lixivium, is conveyed by troughs to the Alum-houfe,
into cifterns; and from them into the pans, where it is boiled
about twenty-four hours. Then add a certain quantity of the
lee of kelp ; the whole is drawn off into a fettler, where having
remained about an hour, that the fulphur and other dregs may
have time to fettle to the bottom, it is conveyed into coolers :
This done, to every ton of the liquor they add about eight gal-
lons of urine ; and having flood four days and nights, till quite
cool, the Alum begins to cryftallife on the fides of the vefTel,
from which being fcraped off, it is wafhed with fair water, and
then thrown into a bin, to let the water drain off; after this
it is thrown into a pan, called the rocking pan, and there melt-
ed, in which flate it is conveyed by troughs into tuns, where
it flands about ten days, till perfectly condenfed ; then, flaving
the tuns, the Alum is taken out chipped, and carried to the
florehoules. This is what we commonly call roche, or rock
Alum, as being prepared from flones cut from the rocks of the
quarry, and ftands contradiftinguifhed from the common Alum,
or that prepared from the earth.
ALUM Water ; boil four ounces of Allum in a quart of
rain or river water, till the Allum is diffolved, and let it ftand
twenty-four hours.
With this water wafh the prints you defign to colour, and
it will fix the paper fo, that the colours will not fink or run in *
it, when you lay them on, and will help, likewife, to brighten
your colours.
If