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Ravelin or triangular bastion

Rivellino o bastione triangolare

This relief model represents a triangular outwork, or ravelin, for the military defence of the entrance to a fortress. The drawing of the ravelin shown here was probably inspired by a feat of architecture already existing. It dates back to the period when Leonardo was in Romagna to oversee Cesare Borgia's fortifications. The model shown here, which is in the shape of a triangle, has three small service buildings on top. Along the top, there is also a communication trench which can be used as parade-ground for the upper line of embrasures.

Manuscript L, sheet 65 r.


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