An early American woodcut of a lock in action, published on the title page of “History of the Rise, Progress, and Existing Condition of the Western Canals in the State of New-York,” by Elkanah Watson, published in 1820. (Library of Congress)
An early American woodcut of a lock in action, published on the title page of “History of the Rise, Progress, and Existing Condition of the Western Canals in the State of New-York,” by Elkanah Watson, published in 1820. (Library of Congress)