East End, Parthenon. Measurements of the Curvature of the Upper step, and of the Architrave. Plate 10, Chapter 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
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Acropolis Architecture Athens Classical Doric Parthenon Reconstructions and Plans Temple