[....] So, the vault built in our workshop is based on this principle, it was constructed with a single arch, the central part of the oval. As we said, the displacement of this arch generates, not a spherical pendentif vault, but a translation surface that can be built with only one arch (photo 6).

The vault is designed in full scale on the walls of the classroom. First, the curvatures of ribs were drawn using the same circumference, following the criteria above mentioned. Later, the ribs sections were drawn in detail (photo 7).

Vandelvira in his treaty already warns that the ribs of this type of vaults can be built with square section or distorted section. The distorted section ribs, according to the gothic tradition, keep the axis of its section vertical whatever the position of this arc is in the vault. As you can see, this circumstance changes all sections of the ribs, from the top of the vault to its perimeter, where the distorted sections are maximal (photo 8, 9). [....]

1 ..... 2 ..... 3 ..... 4 ..... 5