Propylaea Doric column "Entasis from Middle Column, North Wing. Plate 33, Chapter V & X. 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 Athens Classical Doric Reconstructions and Plans Temple