Pennethorne, John; Robinson, John [Ill.]: The geometry and optics of ancient architecture: illustrated by examples from Thebes, Athens, and Rome (London [u.a.], 1878)

THE OEtfAJOBTTS, MOULDINGS, AND ENTABLATUBES.

195

by dividing the 1st modulus by 6, a second modulus is obtained, which regulates the details of
the cornice; and in the proportioning of the Greek Entablatures the whole apparent height is
generally divided into three apparently equal parts, namely, the architrave, the frieze, and the
cornice, and the whole apparent height of the cornice being divided into some given number
of aliquot parts we obtain a 2nd modulus, which regulates the details of the cornice, etc.
Thus, taking for example—

Plate XII., Fig. 1.—The North-West Angle of the Entablatube of the Parthenon.

= 13984",

The given apparent height of the^
Entablature from the abacus
to the fascia above the corona,

Apparent projection of the abacus = 237"

13984/;

8~~

= 1748" = 1st given apparent modulus of
Entablature.

Whole height of
cornice.

Architrave. Frieze.

Apparent modulus 1748" x 3 = 5244" = 5244" -

Note.—The projection of the abacus
apparently cuts off a small portion in
the height of the Entablature, and this
quantity = 237'7 is thrown into the soffit
of the cornice.

The 1st given horizontal
modulus, which regulates
the projections measured
upon the line AB .

The given apparent height)
of the cornice . . ]

0*4442 ft.

- 5244'-

? i

Then for the horizontal]
details of the Entablature
let this given modulus be
divided by 3 .

Then for the apparent
heights of the details of
the cornice let 5244" be
divided by 12

04442

= 0148 = hori-

zontal modulus for the
details of Entablature.

5244''

= 437" = apparent
modulus for the details
of the cornice.

Having determined the values of these two moduli, 0'148 feet for the projections, and
437" for the apparent heights, then all the details can be figured in aliquot parts, as shown

in Fig. 1.

The apparent heights of the cornice . . = 1 + 3 + 1 + 5 + 2 = 12 apparent parts in seconds.

The horizontal projections of the Entablature=18 + 3 + 2 + 2 =25 horizontal aliquot parts.

Plate XIII., Fig. 1.—The Central Portico of the Propyl^ea.

The given apparent height of the Entablature = 18093",

18093''
15

1206-2" = 1st apparent

modulus of the Entablature; 1206'2"x 5 = 6031" = frieze; 6031"=architrave; 6031" = cornice.

The first given horizontal
modulus, which regulates
the projections measured
upon the line AB .

= 0-32 ft.

Then for the horizontal
details of the Entablature
let this modulus be divided
as follows

0-32 x 2

0-64

7 7 =0-0914;

0-0914 feet = horizontal
modulus for the details
of the Entablature.