Parthenon.
Various Sections of the Curvature of the Pavement, and Projection of the abacus of each angle Column on the Upper step. Plate 13Chapter III, Sect. 3. By Francis Penrose, 1888.

An investigation of the principles of Athenian architecture: or the results of a recent survey conducted chiefly with reference to the optical refinements exhibited in the construction of the ancient buildings at Athens.
Francis Penrose, 1888

Source: https://digi.ub.uni-heidelberg.de/diglit/penrose1888
Images in the public domain

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Acropolis Architecture Athens Classical Doric Parthenon Reconstructions and Plans Temple