Gatling Guns for the Shannon. 1881.

            The above image showing a swivel mounted Gatling gun of the United States Navy

                            Image courtesy of the National Museum of the U.S. Navy.

          https://en.wikipedia.org/wiki/National_Museum_of_the_United_States_Navy.

Image courtesy of The British Newspaper Archive.

Dave Stroud.ramrodantiques.co.uk