Church elevation, fortress plans, and courtyard lighting
A square-plan church, fortifications with a round tower, and how high walls admit sky-light to a court
The sheet gathers a square-plan church seen in elevation at the left, fortification plans including one built around a circular tower and a second fortified complex at the centre and upper right, and, below, a diagram of the natural lighting of a courtyard. Leonardo reasons that if the court's walls rise only to r m and f n it is lit by the sky c d, but if they rise higher to r s and f t it receives light only from the sky a b. The architectural passages are drawn faintly and carry no text of their own.
On this page
Square-plan church in elevation
At the left stands the elevation of a church on a square plan, a temple-like front with a pediment carried on columns, a drum-and-dome rising behind and a smaller domed lantern beside it. It is drawn in light strokes without accompanying text.
Fortress with a circular tower and a second fortified complex
The centre and upper right carry fortification plans, one built around a large circular tower and a second forming a wider fortified complex of walls and square bastions. They are set out faintly in plan.
Natural lighting of a courtyard
A wide arc drawn over crossed sight-lines diagrams how a courtyard is lit from the sky. Leonardo reasons that if the court's walls rise only to r m and f n it is lit by the sky c d, but if they rise higher to r s and f t it sees and receives light only from the sky a b.