RML 8 inch 9 ton gun
Encyclopedia
The British RML 8 inch 9 ton guns Mark I - Mark III were medium rifled muzzle-loading guns used to arm smaller ironclad warships and coast defence batteries in the later 19th century.
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Rifling was of the "Woolwich" pattern of a small number of broad shallow grooves : 4 grooves with twist increasing from 0 to 1 turn in 40 calibres (i.e. in 320 inches) at the muzzle.
Design
In common with other Royal Ordnance RML designs of the 1860s, Mark I used the strong but expensive Armstrong system of a steel tube surrounded by a complex system of multiple wrought-iron coils, which was progressively simplified in Marks II and III to reduce costs : Mark III consisted only of A tube, B tube, breech coil and cascabelCascabel (artillery)
A cascabel is a subassembly of a muzzle loading cannon - a place to attach arresting ropes to deal with the recoil of firing the cannon.Generally comprising the knob and the neck , with particular models also featuring a filet . By some definitions, the cascabel additionally includes the base of...
screw.
Rifling was of the "Woolwich" pattern of a small number of broad shallow grooves : 4 grooves with twist increasing from 0 to 1 turn in 40 calibres (i.e. in 320 inches) at the muzzle.