Civil engineering: a canal passing through hilly terrain (above), and diagrams of canal locks and pressure-regulating mechanisms (below). Engraving.
Wellcome Collection

Civil engineering: a canal passing through hilly terrain (above), and diagrams of canal locks and pressure-regulating mechanisms (below). Engraving.

Unknown artist

CC0 — Public Domain
Wellcome Collection

Lettering: Perspective view of part of a canal with locks.

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