Croton Aqueduct Tunnelling Method — Jervis Drawing (1837) Ink and watercolor engineering drawing by chief engineer John B. Jervis showing workers tunnelling through earth during the construction of the Croton Aqueduct. Jervis designed the entire 41-mile system, including the dam, aqueduct, and High Bridge. Date: 1837 Type: illustration Subjects: tunnel, workers, construction, aqueduct Text visib…