Bolt-Latch Rod and Vault Geometry Schemes
A tall latched rod drawn in pen over faint red-chalk plans for a building's vaults
A bold pen drawing dominates the leaf: a long vertical shaft with an oval loop or ring at the top and a T-shaped bolt-latch mechanism near its lower end. Behind it, faint red-chalk constructions lay out geometric schemes for the vaults of a building, annotated with numbers and measurements in braccia. The two subjects sit on the same page but belong to different studies.
On this page
Vertical rod with ring and bolt-latch
The dominant drawing shows a tall vertical rod topped by an oval loop or ring, with a horizontal T-bar and a bolt-latch fitting toward its lower end. It reads as a latch or locking mechanism operated along the length of the shaft.
Geometric schemes for a building's vaults
Fainter constructions carry numbers and measurements (20, 39, 50 and spans given in braccia) applied to the vaults of a building. They set out the proportional geometry of the vaulting rather than a finished elevation.