Exaggerated Sections of the Curratures of the Temple of Theseus (now known as Temple of Hephaestus) in the Agora of Athens. Plate 36, Chapter VI. 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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Agora Architecture Athens Classical Doric Reconstructions and Plans Temple Temple of Hephaestus