вертлюжная пушка(The term swivel gun (or simply swivel) usually refers to a small cannon, mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to switch between rifled and smoothbore barrels. Swivel guns should not be confused with pivot guns, which were far larger weapons mounted on a horizontal pivot, or screw guns, which are a mountain gun with a segmented barrel. wikipedia.org)
вертлюжное орудие(Вертлюжное орудие (вертлюжная пушка) — небольшое поворотное артиллерийское орудие, устанавливаемое на борту корабля или стене крепости или форта с помощью шарнира (вертлюг), который обеспечивал свободное вращение орудия в двух плоскостях. Имело распространение в XV—XIX веках как на флоте, так и в сухопутной армии. wikipedia.org)
