Lib. II.
A plate-numbered engraved folio from a late eighteenth-century Italian military treatise, catalogued under the title Lib. II, held by the Stiftung Bibliothek Werner Oechslin in Einsiedeln and aimed at engineers and officers. The two pictures are plain black-line plates: the first shows several small hut and shelter types with figures labelled Fig. 1 to Fig. 5, and the second is a fortress ground plan with bastions and ramparts, labelled with the Italian siege title. A designer could take the crisp hatching, labelled numbered diagrams, and the star-shaped bastion geometry as models for technical schematics.
