The Palliser converted type is confined to the 64-pdr. calibre.
The Armstrong breech-loader is no longer manufactured, but there are many guns of this type in service. These breech-loaders were originally of two types, known as the screw and the wedge gun. The latter was designed especially for naval use, but it has been entirely withdrawn from service, leaving only the screw type. It is not improbable that another type of breech-loaders will eventually find its way into service, having a breech-closing arrangement similar to the French type in principle.
64-pdr.
SECTION OF GROOVE FULL SIZE.
French Groove.
French Modified Groove.
