DOI Page / Citation link:
https://doi.org/10.11588/diglit.19574#0081
BRA 67
bark; and fuch as, upon being fplit, from pale, becomes red-
difh; and, being chewed, has a fugary tafte.
It is much ufed in dying, where it ferves for a red colour,
but it gives only a fpurious colour, and eafily evaporates and
fades ; nor is the wood to be ufed without alum and tartar.
From the Brafil of Fernambouc is drawn a kind of carmine, by
means of acids.
There is alfo a liquid lacca made of it for painting in minia-
ture.
To make lake, or tinSiure o/"Brasil. The Brafil, meant
here, is that which the dyers make ufe of. Take of the fineft
that comes from Fernambouc, that being the beft.
The way of extracting this tincture is the fame as that from
kermes. See KERMES.
BRASS, or, as the French call it, yellow copper, is a fac-
titious metal, made of copper and lapis calaminaris.
The method of preparing it is as follows: The lapis, having
been calcined, and ground fine as flour, is mixed with ground
charcoal; and incorporated, by means of water, into a mafs:
This being done, about feven pounds of the lapis calaminaris are
put into a melting-pot that will contain about a gallon ; and
over that about five pounds of copper ; this pot is let down into
a wind-furnace, eight feet deep, where it remains for eleven
hours, in which time it is converted into brafs.
This metal, then, is caff, either into plates or lumps ; forty-
five pounds of crude lapis calaminaris, or calamine, will produce
thirty pounds when calcined or burnt.
Sometimes Brafs fhrufFis ufed inftead of copper ; but that is
not always to be procured in quantities fufficient, it being no
other than a collection of old Brafs.
Pure Brafs is not malleable, unlefs when it is hot; for, when
it is cold, it will break. And, after it has been melted twice,
it will be no longer in a condition to bear the hammer at all,; but,
in order to render it capable of being wrought, they put feven
pounds of lead to a hundred pounds of brafs, which renders it
more foft and pliable.
The beft proportion for gun-metal for catting great guns is
faid to be a thoufand pounds of copper, nine hundred pounds
of tin, and fix hundred pounds of Brafs in eleven or twelve thou-
fand weight of metal.
The beft Brafs guns are made of malleable metal, not of
pure copper and calamine alone ; but coarfer metals are ufed to
make it run clofer and founder, as lead and pot-metal, which
laft is made of Brafs and lead ; twenty pounds of lead are ufual-
put into a hundred pounds of pot-metal.
Corinthian Brass, has been famous in antiquity, and is a
F 2 mjxture
bark; and fuch as, upon being fplit, from pale, becomes red-
difh; and, being chewed, has a fugary tafte.
It is much ufed in dying, where it ferves for a red colour,
but it gives only a fpurious colour, and eafily evaporates and
fades ; nor is the wood to be ufed without alum and tartar.
From the Brafil of Fernambouc is drawn a kind of carmine, by
means of acids.
There is alfo a liquid lacca made of it for painting in minia-
ture.
To make lake, or tinSiure o/"Brasil. The Brafil, meant
here, is that which the dyers make ufe of. Take of the fineft
that comes from Fernambouc, that being the beft.
The way of extracting this tincture is the fame as that from
kermes. See KERMES.
BRASS, or, as the French call it, yellow copper, is a fac-
titious metal, made of copper and lapis calaminaris.
The method of preparing it is as follows: The lapis, having
been calcined, and ground fine as flour, is mixed with ground
charcoal; and incorporated, by means of water, into a mafs:
This being done, about feven pounds of the lapis calaminaris are
put into a melting-pot that will contain about a gallon ; and
over that about five pounds of copper ; this pot is let down into
a wind-furnace, eight feet deep, where it remains for eleven
hours, in which time it is converted into brafs.
This metal, then, is caff, either into plates or lumps ; forty-
five pounds of crude lapis calaminaris, or calamine, will produce
thirty pounds when calcined or burnt.
Sometimes Brafs fhrufFis ufed inftead of copper ; but that is
not always to be procured in quantities fufficient, it being no
other than a collection of old Brafs.
Pure Brafs is not malleable, unlefs when it is hot; for, when
it is cold, it will break. And, after it has been melted twice,
it will be no longer in a condition to bear the hammer at all,; but,
in order to render it capable of being wrought, they put feven
pounds of lead to a hundred pounds of brafs, which renders it
more foft and pliable.
The beft proportion for gun-metal for catting great guns is
faid to be a thoufand pounds of copper, nine hundred pounds
of tin, and fix hundred pounds of Brafs in eleven or twelve thou-
fand weight of metal.
The beft Brafs guns are made of malleable metal, not of
pure copper and calamine alone ; but coarfer metals are ufed to
make it run clofer and founder, as lead and pot-metal, which
laft is made of Brafs and lead ; twenty pounds of lead are ufual-
put into a hundred pounds of pot-metal.
Corinthian Brass, has been famous in antiquity, and is a
F 2 mjxture