A: Penetrations by small semi-circular vaults sprung from same level. B: Intersection by small semicircular vault sprung from higher level; groins form wavy line. C: Intersection by narrow pointed vault sprung from same level; groins are plane curves.

Vaults, Penetrations and Intersections

A: Penetrations by small semi-circular vaults sprung from same level. B: Intersection by small semicircular…