This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Sketch illustrating the progress of the survey of the coast in showing the positions occupied in making observations upon currents in New York Bay and Harbor and the East River. NYPL. Sketch illustrating the progress of the survey of the coast in showing the positions occupied in making observations upon currents in New York Bay