Design models and "attention" to the topography of the places in the sixteenth strongholds of Sardinia: the use of the tenaille.

The present contribution proposes, through some representative digital models and graphical schemes, some technical aspect that characterizes the work of Jacopo and Giorgio Paleari Fratino, military engineers in the service of Philip II of Spain in the second half of the sixteenth-century. Matrices and geometric models directly extracted from the military treatises, in particular from the text Della fortificatione della città wrote by G. Maggi and J.F. Castriotto and published in Venice in 1564, are skillfully adapted to the topography of the places and lead plastic solutions that optimize resources and respect of architectural design of modern fortifications. A research set on the graphical analysis of archival documents, examination of military treatises, survey of the existing structures of Sardinia and a comparison with the works realized in the Spanish strongholds of the Mediterranean area that confirms and emphasizes the phrase, attributed to Paleari and reported in historical archive documents, that reiterates to acompagnar las obras con la naturaleza del sitio (execute the works according to the topography of the places).