A time ball (not from the Titanic Memorial Lighthouse) and exhibit page about time balls produced by the United States Navy
Seamen's Church Institute
Seamen’s Church Institute provides digital access to materials from its Archives for educational and research purposes. Responsibility for determining copyright status of and securing permission to use an item rests with the person desiring to use the material.
Seamen's Church Institute, “Time Ball,” Seamen's Church Institute Archives, accessed April 13, 2021, https://seamenschurch-archives.org/items/show/164.