A significant amount of text from the back of the page is visible through the paper, especially around the central and right areas of the architectural diagram.

BOOK 4

This complex architectural engraving illustrates the proportions of a classical order. It features a capital, entablature, column base, and pedestal. The diagram includes a central semi-circular arch supported by pilasters. The upper portion shows a detailed cross-section of a column capital labeled with letters A through E. The central portion shows the entablature and the arch, with labels H, I, K, L, M, and F. The lower portion displays the column base and pedestal, labeled G, N, O, and P. Numerical measurements, such as 10, 8, 14, 7 and a half, 3, 5, 15, and 16, are meticulously recorded along the vertical and horizontal axes of the drawing to indicate proportions. A textual legend is situated within a rectangular frame on the right side of the diagram, identifying the labeled components.

M O I

I, cyma recta and cyma reversa

These architectural terms describe S-shaped molding profiles. A cyma recta curves outward at the top, while a cyma reversa curves inward at the top. H Cornice. I Frieze. K Architrave. L Capital. M Shaft of the column below the capital original: "Vivo della colonna" — the "living" or main body of the column shaft. N Base of the column at the bottom. O Pedestal of the column. P Base of the Pedestal { cyma recta and cyma reversa }.

To the right of the Architrave marked L is the profile of an Architrave made simply, in a plain manner.

Technical