Sketch illustrating the progress of the survey of the coast in 1845 showing the positions occupied in making observations upon currents in New York Bay & Harbor and the East River.

The New York Public Library states no known U.S. copyright for this item. Pinax admits it as US-PD only because the work predates 1900, making public domain near-certain worldwide; status outside the U.S. is not asserted and reuse elsewhere is the user's responsibility. Credit: From The New York Public Library.