DOI Page / Citation link:
https://doi.org/10.11588/diglit.19574#0407
374 G L A
alfo the violent effects of the polverine, which penetrates every
thing elfe.
But two of thefe pots are wrought at, the reft ferving to pre-
pare the matter for them.
The fire of the furnace is made and kept up with dry hard
wood, caft in w thout intermiffion at the fix apertures: This is
never omitted, even upon the moll folemn days.
When the matter, contained in the two pots, is fuflkiently
vitrified, then they are wrought, by taking out the metal, blow-
ing, and fafbioning it.
The metal having been now fufficiently refined, the operator
or fervitor takes his blowing iron, which is a hollow tube, about
two feet and an half long, or longer, and, dipping it into the
melting pot, there turns it about, and the metal flicks to the iron,
like fome glutinous or clammy juice, much like, but more firmly
than Venice treacle.
For each Glafs he dips four times, and at each dip rolls the
end of his inffrument, with the Glafs upon it, on a piece of iron,
over which is a veflel of water, the coolnefs whereof helps to
confolidate the Glafs more readily, and difpofes it the better to
bind with the next to be taken out of the pot; when the opera-
tor has dipped the fourth time, and there is now metal enough
upon the blowing iron, he blows gently through the iron, by
which he raifes or lengthens it nearly a foot, after the manner
as is done by blowing in a bladder or globe; and, to give it a
polifh, he rools it to and fro on a ftone. See plate XIX, fig. 3.
where A reprefents the blowing iron ; B, the fecond ftory of
the furnace; C, the bocca ; and D, the upper fiery of the fur-
nace.
Then he blows again a fecond time, and thus forms the bunch
or belly of the Glafs. The matter, by this fecond blaft, afTumes
the figure of a gourd or callebafh, eighteen or twenty inches
in diameter.
As often as the operator blows into the iron, which mull be
very often, he removes it haftily from his mouth to his cheek,
left he fhould draw the flame into his mouth, when he applies
it again to the iron.
Then he whirls the iron many times round his head to lengthen
and cool the Glafs; fometimes the Glafs, being thus blown round,
is returned to the fire, where it flattens a little of itfelf; when flat-
ted, it is taken out and cooled ; and, if it be required as to the
form intended, the workman flattens the bottom a little, by pref-
fing it on the marble, or moulds it in the ftamp irons; and thus
delivers it to the rnafter workman, to break off the collet.
The collet, or neck, is the narrow part which clove to the iron:
To fet the Glafs at liberty, they put a drop of cold water on
the
alfo the violent effects of the polverine, which penetrates every
thing elfe.
But two of thefe pots are wrought at, the reft ferving to pre-
pare the matter for them.
The fire of the furnace is made and kept up with dry hard
wood, caft in w thout intermiffion at the fix apertures: This is
never omitted, even upon the moll folemn days.
When the matter, contained in the two pots, is fuflkiently
vitrified, then they are wrought, by taking out the metal, blow-
ing, and fafbioning it.
The metal having been now fufficiently refined, the operator
or fervitor takes his blowing iron, which is a hollow tube, about
two feet and an half long, or longer, and, dipping it into the
melting pot, there turns it about, and the metal flicks to the iron,
like fome glutinous or clammy juice, much like, but more firmly
than Venice treacle.
For each Glafs he dips four times, and at each dip rolls the
end of his inffrument, with the Glafs upon it, on a piece of iron,
over which is a veflel of water, the coolnefs whereof helps to
confolidate the Glafs more readily, and difpofes it the better to
bind with the next to be taken out of the pot; when the opera-
tor has dipped the fourth time, and there is now metal enough
upon the blowing iron, he blows gently through the iron, by
which he raifes or lengthens it nearly a foot, after the manner
as is done by blowing in a bladder or globe; and, to give it a
polifh, he rools it to and fro on a ftone. See plate XIX, fig. 3.
where A reprefents the blowing iron ; B, the fecond ftory of
the furnace; C, the bocca ; and D, the upper fiery of the fur-
nace.
Then he blows again a fecond time, and thus forms the bunch
or belly of the Glafs. The matter, by this fecond blaft, afTumes
the figure of a gourd or callebafh, eighteen or twenty inches
in diameter.
As often as the operator blows into the iron, which mull be
very often, he removes it haftily from his mouth to his cheek,
left he fhould draw the flame into his mouth, when he applies
it again to the iron.
Then he whirls the iron many times round his head to lengthen
and cool the Glafs; fometimes the Glafs, being thus blown round,
is returned to the fire, where it flattens a little of itfelf; when flat-
ted, it is taken out and cooled ; and, if it be required as to the
form intended, the workman flattens the bottom a little, by pref-
fing it on the marble, or moulds it in the ftamp irons; and thus
delivers it to the rnafter workman, to break off the collet.
The collet, or neck, is the narrow part which clove to the iron:
To fet the Glafs at liberty, they put a drop of cold water on
the