The Gorgas machine gun (or sometimes just a Gorgas gun) was a manually cranked prototype machine gun, the creation of Confederate States General Josiah Gorgas.
The barrel was fed from a revolver-like ring, but with an axis of rotation perpendicular to the bore, rather than the usual revolver configuration with parallel axes.
The cylinder housed 18 copper-lined chambers that were muzzle loaded from the outer side of the ring.
The interior side of the multiple-chamber ring was lined with the corresponding 18 percussion cap nipples.
The sole exemplar built was not used in combat, not having been sufficiently perfected.