DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19575#0366
T U R
that axis; while an edged tool, fet ready to the outfide of the
fubftance in a circumvolution of it, cuts off all the parts that lie
further off from the axis ; and makes the outfide of that fub-
ftance concentric to the axis.
The principal inftruments ufed in Turning, befides the lathe,
are chiffels and mandrils of various forms.
The invention of Turning feems to be very ancient. Some
indeed, to do honour to the age, will have it, that it has been
brought to perfection by the moderns; but if what Pliny, and
fome other ancient authors relate, be true, that the ancients turn-
ed thofe precious vafes, enriched with figures and ornaments in
relievo, which are ftill to be feen in the cabinets of the curious j
it muff be owned, that all which has been added in thefe ages,
makes but a poor amends for what we have loft of the manner of
Turning of the ancients.
TURPENTINE, is a tranfparent gum, which flows either
naturally or by incifion, from feveral fatty, refinous trees, fuch as
terebinthus, larch, pine, fir, &o
There are feveral forts of Turpentine ; as that of Chio, that
of Venice, that of Bourdeaux, that of Cyprus, Strafburg, &c.
The Turpentine of Chio, which is the only genuine kind, and
that which gives the name to all the reft, is a whitifh refin, bor-
dering a little on the green, very clear, and fomething odorife-
rous ; it is drawn by incifion from a tree called terebinthus,
which grows plentifully in that ifiand, as alfo in Cyprus, and
fome parts of France and Spain.
It fhould be chofen of a folid confidence, almoft without either
tafte or fmell, and not at all tenacious, which diftinguifhes it
from the falfe Turpentine of Venice, which is commonly fubfti-
tuted in its place, having both a ftrong fmell and a bitter tafte,
and is very flicking or clammy.
This Turpentine of Chio is undoubtedly thebeft for many ufes;
but the fcarcity of it is the caufe, that it is but little in ufe.
The Venice Turpentine is falfly fo called ; for, though there
was a Turpentine anciently brought from Venice, yet that,
which is now lb called, comes from Dauphine in Fi ance.
It is liquid, of the confidence of a thick fyrup, and whitifh ; and
Sows either fpontaneoufly, or by incifion, from larches, firs, and
pines, chiefly in the wood de Pilatze.
That which flows naturally, is a kind of balm, not inferior in
virtue to that of Peru, and is frequently fubftituted for it.
That which is drawn by incifion, after the tree has left off
yielding fpontaneoufly, is of very confidcrable ufe in feveral arts,
and is that of which varnifh is made.
This is to be chofen white and tranfparent,, and great caution
that axis; while an edged tool, fet ready to the outfide of the
fubftance in a circumvolution of it, cuts off all the parts that lie
further off from the axis ; and makes the outfide of that fub-
ftance concentric to the axis.
The principal inftruments ufed in Turning, befides the lathe,
are chiffels and mandrils of various forms.
The invention of Turning feems to be very ancient. Some
indeed, to do honour to the age, will have it, that it has been
brought to perfection by the moderns; but if what Pliny, and
fome other ancient authors relate, be true, that the ancients turn-
ed thofe precious vafes, enriched with figures and ornaments in
relievo, which are ftill to be feen in the cabinets of the curious j
it muff be owned, that all which has been added in thefe ages,
makes but a poor amends for what we have loft of the manner of
Turning of the ancients.
TURPENTINE, is a tranfparent gum, which flows either
naturally or by incifion, from feveral fatty, refinous trees, fuch as
terebinthus, larch, pine, fir, &o
There are feveral forts of Turpentine ; as that of Chio, that
of Venice, that of Bourdeaux, that of Cyprus, Strafburg, &c.
The Turpentine of Chio, which is the only genuine kind, and
that which gives the name to all the reft, is a whitifh refin, bor-
dering a little on the green, very clear, and fomething odorife-
rous ; it is drawn by incifion from a tree called terebinthus,
which grows plentifully in that ifiand, as alfo in Cyprus, and
fome parts of France and Spain.
It fhould be chofen of a folid confidence, almoft without either
tafte or fmell, and not at all tenacious, which diftinguifhes it
from the falfe Turpentine of Venice, which is commonly fubfti-
tuted in its place, having both a ftrong fmell and a bitter tafte,
and is very flicking or clammy.
This Turpentine of Chio is undoubtedly thebeft for many ufes;
but the fcarcity of it is the caufe, that it is but little in ufe.
The Venice Turpentine is falfly fo called ; for, though there
was a Turpentine anciently brought from Venice, yet that,
which is now lb called, comes from Dauphine in Fi ance.
It is liquid, of the confidence of a thick fyrup, and whitifh ; and
Sows either fpontaneoufly, or by incifion, from larches, firs, and
pines, chiefly in the wood de Pilatze.
That which flows naturally, is a kind of balm, not inferior in
virtue to that of Peru, and is frequently fubftituted for it.
That which is drawn by incifion, after the tree has left off
yielding fpontaneoufly, is of very confidcrable ufe in feveral arts,
and is that of which varnifh is made.
This is to be chofen white and tranfparent,, and great caution