Geometric Figures, the Horizon, and Architectural Sketches
Line figures, a sight-line to the earth's curve, with studies of domes and church plans
The e-Leo record carries only the cataloguer's note that this side is "devoid of writing," yet the sheet is in fact densely covered with cursive text and diagrams that remain untranscribed. Its centre is filled with a swarm of straight-line, net- and star-like geometric figures, matching the scholarly tag on the number and surfaces of portions. At the top right a source sends radiating sight-lines to a sphere, consistent with the noted study of the earth's curvature and the distance of the horizon. Along the lower edge sit small architectural drawings of domes, arches and a centralized church plan.
On this page
Interlocking straight-line geometric figures
The middle of the sheet is packed with clusters of straight-line figures woven into net- and star-like patterns, drawn over and against one another. They accord with the scholarly note on the number and surfaces of geometric portions. Accompanying cursive notes beside them are not included in the transcription.
Sight-line diagram toward a distant sphere
At the upper right a point sends a fan of straight lines converging on a small sphere. This agrees with the noted study of how the curvature of the earth's surface governs the distance of the horizon and what the eye can reach. The written reasoning around it is present on the sheet but untranscribed.
Small studies of domes and a church plan
Along the bottom edge Leonardo has sketched a row of small architectural drawings: domed and vaulted structures seen in elevation, arches, and a centralized ground plan. They are rendered lightly in pen and lead. No related caption for these was transcribed.