DOI Page / Citation link:
https://doi.org/10.11588/diglit.4423#0101
THE APPARENT PROPORTIONS. TL
PLATE V.
THE WEST PORTICO OF THE PROPYLS A.
«
This is the only example in the Acropolis of Athens of a design made to suit a central
point of sight, which in this case was essential, and it is also the only instance in which the
Doric and Ionic orders are combined together to be seen from the same point of view.
The arrangement of the design is the same as in the other examples already explained,
but the calculations are simplified by the corrections being made to suit a central point of sight.
Fig. 1. The Plan of the West Portico traced upon the horizontal plane XY passing through
the point of sight 0, No. 1, with the first masses of the elevation of the Portico
traced upon the vertical plane XZ.
Fig. 2. Plan of the given projections, to an enlarged scale, traced upon the plane XY.
Fig. 3. In this example Fig. 3 is omitted, as no correction is required in the first given height
of the Portico = 43'227 ft.; as there is no return side, the whole height is made a
given quantity.
Fig. 4. The given heights of the Portico, traced upon the planes HOZ ; the lineal magnitudes
are all commensurable, and the apparent magnitudes are found by calculation to
be incommensurable, when they are compared with the apparent whole height.
Fig. 5. The corrected design in which all the visual angles are commensurable with each
other and with the whole apparent height.
The result of this first calculation gives the following additions and subtractions in
the design of the Portico—
Column. Entablature. Steps. Pediment.
+ 0-372 . . . . + 0*40 .... — 0-75 .... — 0'64
PLATE VI.
THE NORTH WING OF THE PROPYLiEA.
This is a design in Antis, with three columns between the Antae. and with the Pediment
omitted; it, therefore, differs from other Greek examples. Another peculiarity is, that it was
first designed as a separate work, to be seen from the angular point of sight 0, No. 2, and
then annexed to the Propylaea, by building the wall A, Fig. 1, upon the fine of the Lower
PLATE V.
THE WEST PORTICO OF THE PROPYLS A.
«
This is the only example in the Acropolis of Athens of a design made to suit a central
point of sight, which in this case was essential, and it is also the only instance in which the
Doric and Ionic orders are combined together to be seen from the same point of view.
The arrangement of the design is the same as in the other examples already explained,
but the calculations are simplified by the corrections being made to suit a central point of sight.
Fig. 1. The Plan of the West Portico traced upon the horizontal plane XY passing through
the point of sight 0, No. 1, with the first masses of the elevation of the Portico
traced upon the vertical plane XZ.
Fig. 2. Plan of the given projections, to an enlarged scale, traced upon the plane XY.
Fig. 3. In this example Fig. 3 is omitted, as no correction is required in the first given height
of the Portico = 43'227 ft.; as there is no return side, the whole height is made a
given quantity.
Fig. 4. The given heights of the Portico, traced upon the planes HOZ ; the lineal magnitudes
are all commensurable, and the apparent magnitudes are found by calculation to
be incommensurable, when they are compared with the apparent whole height.
Fig. 5. The corrected design in which all the visual angles are commensurable with each
other and with the whole apparent height.
The result of this first calculation gives the following additions and subtractions in
the design of the Portico—
Column. Entablature. Steps. Pediment.
+ 0-372 . . . . + 0*40 .... — 0-75 .... — 0'64
PLATE VI.
THE NORTH WING OF THE PROPYLiEA.
This is a design in Antis, with three columns between the Antae. and with the Pediment
omitted; it, therefore, differs from other Greek examples. Another peculiarity is, that it was
first designed as a separate work, to be seen from the angular point of sight 0, No. 2, and
then annexed to the Propylaea, by building the wall A, Fig. 1, upon the fine of the Lower