Trattato della cognizione pratica delle resistenze, geometricamente dimostrato
This is an 1748 Turin treatise on practical strength of materials by the engineer Giovanni Battista Borra, printed by the Royal Press for builders and engineers studying structures. Its engraved plates show geometric diagrams of arches, vaults and beams, along with cannons and pulley-and-weight apparatus, drawn in fine plain line with lettered reference points. A designer might take from them the clean diagrammatic vocabulary of 18th-century technical drawing, with labelled construction lines and stepped voussoirs.
