then rotate the cylinder. The revolver would then be ready to fire again. It was chambered for the 7.5mm Nagant cartridge, which at the time was also used in both the Norwegian and Swedish versions of the Belgian Nagant M1895 revolver. The Webley-Fosbery Automatic Revolver was the first commercial example, introduced in 1901. It was recoil-operated, and the cylinder and barrel recoiled backwards to cock the hammer and revolve the cylinder. It was distinctive in that cam grooves were milled on the outside of the cylinder to provide a means of advancing to the next chamber—half a turn as the cylinder moved back, and half a turn as it moved forward. .38 caliber versions held 8 shots, .455 caliber versions 6. Around 4,750 were made in total. The Union Automatic Revolver of American origin. Only around 65 examples made. The Zulaica Automatic Revolver M. Zulaica y Cia., Eibar, Spain. began manufacturing 'Velo-Dog' type pocket revolvers in the early 1900s. In 1905, Zulaica patented an unusual .22LR automatic revolver design, but few were ever manufactured and even fewer have survived. Zulaica started manufacturing 'Eibar' type automatic pistols under French army contracts in 1915 and 1916, and continued to market them commercially up to the 1920s. In 1997, the Mateba company developed a type of recoil-operated automatic revolver, the Mateba Unica auto-revolver, which uses recoil energy to auto-rotate a revolver cylinder holding 6 or 7 cartridges, depending on the model. The company has made several versions of its "autorevolver", including longer barreled and even rifle-like variations, usually chambered for .357 Magnum ammunition, but also available in larger calibers like .44 Magnum and .454 Casull. See also Revolver cannon References External links The Gun Zone: Webley-Fosbery Automatic Revolver World Guns: Mateba Model 6 Unica auto-revolver Webley Fosbery Automatic Revolver Model 1900 Firearm actions Handguns Revolvers