West End of the Parthenon. Measurements of the Curvature of the Pavement and of the Architrave. Plate 11, 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