Alberti, Leone Battista, Architecture, 1755

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1
CHAP. IV.
The Parts of the Temple are two; the
Portico
and the Inſide: But they differ
very
much from one another in both theſe Re­
ſpects
; for ſome Temples are round, ſome
ſquare
, and others, laſtly, have many Sides.
It
is
manifeſt that Nature delights principally in
round
Figures, ſince we find that moſt Things
which
are generated, made or directed by Na­
ture
, are round.
Why need I inſtance in the
Stars
, Trees, Animals, the Neſts of Birds, or
the
like Parts of the Creation, which ſhe has
choſen
to make generally round?
We find too
that
Nature is ſometimes delighted with Figures
of
ſix Sides; for Bees, Hornets, and all other
Kinds
of Waſps have learnt no other Figure
for
building their Cells in their Hives, but the
Hexagon
.
The Area for a round Temple
ſhould
be marked out exactly circular.
The
Ancients
, in almoſt all their quadrangular
Temples
made the Platform half as long again
as
it was broad.
Some made it only a third
Part
of the Breadth longer; and others would
have
it full thrice the Breadth long.
But in
all
theſe quadrangular Platforms the greateſt
Blemiſh
is for the Corners to be not exactly
rectangular
.
The Polygons uſed by the An­
cients
were either of ſix, eight, or ſometimes

ten
Sides.
The Angles of ſuch Platforms
ſhould
all terminate within a Circle, and indeed
from
a Circle is the beſt Way of deducing
them
; for the Semidiameter of the Circle will
make
one of the ſix Sides which can be con­
tained
in that Circle.
And if from the Cen­
ter
you draw Right-lines to cut each of thoſe
ſix
Sides exactly in the Middle, you will plainly
ſee
what Method you are to take to draw a
Platform
of twelve Sides, and from that of
twelve
Sides you may make one of four, or
eight
, as in Fig. B. C. However here is an­
other
eaſier Way of drawing a Platform of eight
Sides
.
Having drawn an equilateral and right­
angled
Square together with its Diagonals from
Corner
to Corner; from the Point where thoſe
Diagonals
interſect each other in the Middle, I
turn
a Circle, opening the Compaſſes ſo wide
as
to take in all the Sides of the Square; then
I
divide one of thoſe Sides into two equal Parts,
and
through the Point of that Diviſion draw a
Line
from the Center to the Circumference of
the
Circle D, and thus from the Point where
that
Line touches the Circumference to the
Angle
of the Square, will be exactly one of the
eight
Sides which that Circle will contain.
We may alſo draw a Platform of ten Sides by
means
of a Circle, in the following Manner:
Draw
two Diameters in the Circle, interſecting
each
other at Right-angles, and then divide
the
Half of either of thoſe Diameters into two
equal
Parts, and from that Diviſion draw a
ſtraight
Line upwards aſlant to the Head of
the
other Diameter; and if from this ſlant
Line
you take off the Quantity of the fourth
Part
of one of the Diameters, the Remainder of
that
Line will be one of the ten Sides which
can
be contained in that Circle, as you may
ſee
in Letter E. To Temples it is uſual to
joyn
Chapels; to ſome, more; to others fewer.
In quadrangular Temples it is very unuſual to
make
above one, and that is placed at the
Head
, ſo as to be ſeen immediately by thoſe
that
come in at the Door.
If you have a Mind
to
make more Chapels on the Sides, they will
not
be amiſs in thoſe quadrangular Temples
which
are twice as long as broad; and there
we
ſhould not make more than one in each
Side
: Though if you do make more, it will
be
better to make an odd Number on each Side
than
an even one.
In round Platforms, and
alſo
in thoſe of many Faces (if we may ven­
ture
ſo to call them) we may very conveniently
make
a greater Number of Chapels, according
to
the Number of thoſe Faces, one to each, or one
with
and one without alternately, anſwering to
each
other.
In round Platforms ſix Chapels,
or
even eight will do extremely well.
In Plat­
forms
of ſeveral Faces you muſt be ſure to let
the
Corners be exactly anſwering and ſuiting
to
one another.
The Chapels themſelves muſt
be
made either Parts of a rectangled Square, or
of
a Circle.
For the ſingle Chapel at the Head
of
a Temple, the ſemicircular Form is much
the
handſomeſt; and next to that is the rect­
angular
.
But if you are to make a good Num­
ber
of Chapels, it will certainly be much more

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