Alberti, Leone Battista, Architecture, 1755

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CHAP. VIII.
Let us now return to the Capitals. The

Dorians made their Capital of the ſame
Height
as their Baſe, and divided that Height
into
three Parts: The Firſt they gave to the
Abacus
, the Second to the Ovolo which is un­
de
rthe Abacus, and the Third they allowed to
the
Gorgerin or Neck of the Capital which is
under
the Ovolo.
The Breadth of the Abacus
every
Way was equal to one whole Diameter,
and
a twelfth of the Bottom of the Shaft.
This
Abacus
is divided into two Members, an up­
right
Cymatium and a Plinth, and the Cyma­
tium
is two fifth Parts of the whole Abacus.
The upper Edge of the Ovolo joyned cloſe to
the
Bottom of the Abacus.
At the Bottom of
the
Ovolo ſome made three little Annulets, and
others
a Cymatium as an Ornament, but theſe
never
took up above a third Part of the Ovolo.
The Diameter of the Neck of the Capital,
which
was the loweſt Part of it, never exceed­
ed
the Thickneſs of the Top of the Shaſt,
which
is to be obſerved in all Sorts of Capitals.
Others, according to the Obſervations which I
have
made upon ancient Buildings, uſed to
make
the Height of the Doric Capital three
Quarters
of the Diameter of the Bottom of the
Shaft
, and divided this whole Height of the
Capital
into eleven Parts, of which they allow­
ed
four to the Abacus, four to the Ovolo, and
three
to the Neck of the Capital.
Then they
divided
the Abacus into two Parts, the up­
permoſt
of which they gave to the Cymatium
and
the lowermoſt to the Plinth.
The Ovolo
alſo
they divided into two Parts, aſſigning the
lowermoſt
either to the Annulets or to a Cy­
matium
, which ſerved as an Edging to the
Ovolo
, and in the Neck of the Capital ſome
cut
Roſes, and others Leaves with a high Pro­
jecture
.
This was the Practice of the Dorians.

Our
Rules for the Ionic Capital are as follows.
Let the whole Height of the Capital be one
half
the Diameter of the Bottom of the Co­
lumn
.
Let us divide this Height into nineteen
Parts
, or Minutes, three of which we muſt give
to
the Abacus, four to the Thickneſs of the
Volute
, ſix to the Ovolo, and the other ſix be­
low
we muſt leave for the Turn of the Volutes
on
each Side.
The Breadth of the Abacus
every
Way muſt be equal to the Diameter of
the
Top of the Shafts; the Breadth of the Rind
which
is to terminate in the Scroll muſt both
in
the Front and Back of the Capital be equal
to
the Abacus.
This Rind muſt fall down on
each
Side winding round like a Snail-ſhell.
The Center of the Volute on the right Side
muſt
be diſtant from that on the Left two­
and-thirty
Minutes, and from the higheſt
Point
of the Abacus twelve Minutes.
The
Method
of turning this Volute is as follows:
About
the Center of the Volute deſcribe a lit­
tle
Circle, the Semi-diameter of which muſt be
one
of the afore-mentioned Minutes.
This is
the
Eye of the Volute.
In the Circumference
of
this little Circle make two Points oppoſite
to
each other, one above and the other below.
Then fix one Foot of your Compaſſes into the
uppermoſt
Point, and extend the other to the
Line
that divides the Abacus from the Rind,
and
turn it outwards from the Capital till you
have
made a perfect Semi-circle ending Per­
pendicular
under the loweſt Point or Dot in
the
Eye of the Volute.
Then contract your

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