An animation of the Reffye Mitrailleuse of 1867. Multibarrel Mitrailleuse (grapeshot shooters) were originally developed in Belgium in 1851. The Reffye Mitrailleuse, developed for the French Army in 1865, had 25 barrels and fired 13mm bullets. Firing rate was between 75 and 125 rounds per minute; the animation shows the rather cumbersome loading and firing process. France fielded 190 Reffye Mitrailleuse during the FrancoPrussian war (187072) but the tactical use of these machine guns had not been worked out, and they were rarely used effectively. There are excellent articles in Wikipedia on the Reffye Mitrailleuse giving the history and tactics of this gun. I have published other animations of Victorianera machine guns on YouTube (vbbsmyt), and for further information google for Victorian ship models, and anti torpedo boat guns.
Animation created using Cinema 4D.