DOI Page / Citation link:
https://doi.org/10.11588/diglit.19575#0217
t96 F Y R
To dye fill a flight fort o/Furvle. Clap the filk into the
{lighter red dye ; but increafe the quantity of pot-aihes, to turn
if to Purple ; then rinfe and dry it.
To dye thread of a Pwrple colour. Firft alum the thread with
three pounds of alum, half a pound of tartar, and two ounces of
brafil ; dry it, and draw it through the woad or indigo dye; then
rinfe it clean and dry it again ; then, to brown or deepen it, take
twelve ounces of brafil, being firft boiled ; which liquor divide
into three parts, to be ufed at three times.
To the firft add half an ounce of Paris red, a fort of fanda-
rach, one drachm of maftich, and a quarter of an ounce of cal-
cined tartar ; always drying the thread, after you have ufed every
one of the parts of the liquor. The fecond time add half an
ounce of turmeric, two drachms of cinnabar, and half an ounce
of gum arabic. The third time, when the thread becomes red-
difh, add a quart of fharp ley, and by this means the thread will
be dyed of a lafting colour.
PYROTECHNY, from urug, fire, andr£%»>;, art, the fcience
•which teaches the application of fire ; but, in a more particular
fenfe, it implies the doctrine of artificial fireworks.
As rocket's are the principal parts of every fireworks, we fhall
begin with a defcripfion of the moulds they are made in, which
are generally in the form of a cylinder, and generally made of clofe
and hard wood, as white plum-tree, box, &c. Some are alfo
made of ivory, and, for rockets of extraordinary large fixes,, they
are caft in brafs or copper, and the infide nicely turned ; the foot
or bafis of which, with the cylinder, wart, or half bullet, may
be of folid wood. It is agreed, by the moft famous artificers,
that the moulds of all rockets from half a pound to fix pounds
fliould be fix diameters of their orifices high ; but the large fize,
of four, four and an half, or five diameters. Rocket moufds,
from fome ounces to three pounds, are ordinarily feven diameters
of their bore long; the foot, two or three diameters thick ; the
wart, two thirds of the diameter ; and the piercer, one third of the
bore; the roller, two thirds, and always one or two diameters
from the handle longer than the mould ; the rammer, one dia-
meter fhorter than the mould, and fomewbat thinner than the.
roller to prevent the facking of the paper when the charge is
Cammed in. For the better illuftration, plate VII. fig. 2, repre-
fents the mould, with its bafis, cylinder, bore, and piercer.
A B, the inferior diameter of the mould ; C D, the height of
the mould feven diameters; from D to E is the height of the
breech at bottom, which flops the mould when the rocket ia
driving, and this is one and one third diameter. Upon this bot-
tom is a f©i;d cylinder, whole height is one diameter of the ori-
fice A B ; tbjs cylinder, is crowned with a wart or half bullet I,
% having
To dye fill a flight fort o/Furvle. Clap the filk into the
{lighter red dye ; but increafe the quantity of pot-aihes, to turn
if to Purple ; then rinfe and dry it.
To dye thread of a Pwrple colour. Firft alum the thread with
three pounds of alum, half a pound of tartar, and two ounces of
brafil ; dry it, and draw it through the woad or indigo dye; then
rinfe it clean and dry it again ; then, to brown or deepen it, take
twelve ounces of brafil, being firft boiled ; which liquor divide
into three parts, to be ufed at three times.
To the firft add half an ounce of Paris red, a fort of fanda-
rach, one drachm of maftich, and a quarter of an ounce of cal-
cined tartar ; always drying the thread, after you have ufed every
one of the parts of the liquor. The fecond time add half an
ounce of turmeric, two drachms of cinnabar, and half an ounce
of gum arabic. The third time, when the thread becomes red-
difh, add a quart of fharp ley, and by this means the thread will
be dyed of a lafting colour.
PYROTECHNY, from urug, fire, andr£%»>;, art, the fcience
•which teaches the application of fire ; but, in a more particular
fenfe, it implies the doctrine of artificial fireworks.
As rocket's are the principal parts of every fireworks, we fhall
begin with a defcripfion of the moulds they are made in, which
are generally in the form of a cylinder, and generally made of clofe
and hard wood, as white plum-tree, box, &c. Some are alfo
made of ivory, and, for rockets of extraordinary large fixes,, they
are caft in brafs or copper, and the infide nicely turned ; the foot
or bafis of which, with the cylinder, wart, or half bullet, may
be of folid wood. It is agreed, by the moft famous artificers,
that the moulds of all rockets from half a pound to fix pounds
fliould be fix diameters of their orifices high ; but the large fize,
of four, four and an half, or five diameters. Rocket moufds,
from fome ounces to three pounds, are ordinarily feven diameters
of their bore long; the foot, two or three diameters thick ; the
wart, two thirds of the diameter ; and the piercer, one third of the
bore; the roller, two thirds, and always one or two diameters
from the handle longer than the mould ; the rammer, one dia-
meter fhorter than the mould, and fomewbat thinner than the.
roller to prevent the facking of the paper when the charge is
Cammed in. For the better illuftration, plate VII. fig. 2, repre-
fents the mould, with its bafis, cylinder, bore, and piercer.
A B, the inferior diameter of the mould ; C D, the height of
the mould feven diameters; from D to E is the height of the
breech at bottom, which flops the mould when the rocket ia
driving, and this is one and one third diameter. Upon this bot-
tom is a f©i;d cylinder, whole height is one diameter of the ori-
fice A B ; tbjs cylinder, is crowned with a wart or half bullet I,
% having