BOOK ONE

Module A standard unit of measurement derived from the diameter of the column, used to ensure all parts of a building are in proportion., Architecture, Order The specific style of the building, such as Doric or Ionic., Column, Intercolumniation The clear space between two columns., Plan A drawing showing the layout from above., Elevation A drawing showing the vertical face or side of a structure.

This architectural woodcut provides a technical diagram of two columns. They stand on a shared base and support an entablature, which is the horizontal structure consisting of the architrave, frieze, and cornice. The illustration combines a side elevation with a top-down plan view at the bottom. In the elevation, the main horizontal beam is labeled A, while three rectangular blocks situated above it are labeled B. Measurement lines provide specific proportions: the top section measures 1 and 3/4 modules wide, and the total height of the column shaft including its capital is 7 modules. In the plan view at the base, two shaded circles represent the cross-section of the columns. The diameter of the left circle is marked as 1 module. A horizontal line between the centers of these circles indicates a distance of 4 modules, which defines the spacing between the columns from center to center. Faint traces of text from the other side of the page are visible through the paper.