Architectural elevations and layout specifications detailing the heavy iron doorways, sliding mechanisms, and utility piping for a confinement cell in Philadelphia 插畫檔

This technical architectural engraving presents detailed frontal elevations and structural profiles focusing on the entry barriers and utility connections designed for an individual detention unit. Produced during the nineteenth century, these engineering layouts represent the internationally recognized penitentiary design standards and cellular isolation infrastructure implemented within the prison system of the United States. The schematics map out specific security fixtures and technical elements against an alphabetical legend, detailing a reinforced iron door equipped with a small sliding hatch, a heavy wooden corridor sliding door operating on rollers, a mechanical guard call signal system, alongside precise distribution lines for localized gas lighting, fresh water supply, drainage, and steam heating conduits.