Engineering schematics display technical structural designs for various security doors at the Volterra Penitentiary 插畫檔

This technical architectural engraving presents specialized engineering diagrams detailing the precise structural mechanisms and locking systems for three distinct types of secure doors used within a major prison facility located in Italy. Dating from the nineteenth century, the plate categorizes the variations into specific functional types, mapping out the elevation views, profiles, and structural cross-sections for a dormitory entryway, a specialized work cell door, and a secure courtyard promenade gate. Each heavy wooden panel assembly is shown with its respective industrial iron hinge hinges, sliding bolt mechanisms, observation apertures, and internal reinforcing plates, all meticulously drafted at an official administrative scale of 1:25 to record the standardized, high-security penal architecture and institutional design variations of the period.