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Updated: August 5, 2024
His descriptions of the most approved inventions relating thereto are interesting, and we make the following extracts: The sound signals generally used to guide mariners, especially during fogs, are, with certain modifications, sirens, trumpets, steam-whistles, bell-boats, bell-buoys, whistling buoys, bells struck by machinery, cannons fired by powder or gun cotton, rockets, and gongs. Gongs.
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