Improvements in breech mechanisms in the period 1860 to 1880, together with the introduction of large grain powder, caused the Navy to re-adopt the RBL as the new powder required longer barrels which could not be withdrawn into the turret for loading.
32.
It was noted that " Vizcaya " badly needed drydocking because of a badly fouled bottom, her 5.5-inch guns had defective breech mechanisms and had been supplied with defective ammunition, and the fleet had a shortage of stokers.
33.
Improvements in breech mechanisms in the period 1860 to 1880, together with the introduction of large-grain powder, caused the Navy to re-adopt the RBL as the new powder required longer barrels which could not be withdrawn into the turret for loading.
34.
When surplus BL 9.2 inch Mk IV and Mk VI guns became available in the 1890s they were likewise adapted to high-angle carriages, with their obsolete 3-motion breech mechanisms replaced by modern continuous-motion patterns to allow faster loading.
35.
Godsal however, who had reservations about existing bolt action breech mechanisms, continued over the next twenty years to develop rifles based on a travelling block principle, although none of them including an anti-tank rifle developed in World War One were adopted by the military.
36.
During the 1970s in the UK El Gamo marketed two air rifles, the " Marksman ", a conventional . 177 pistol-gripped repeating rifle incorporating a tubular magazine along the top of the cylinder, and using a rising / falling breech mechanism for positioning the pellet.
37.
In April 1935, the third museum opened in building 40, at the north end of the Breech Mechanism Shop constructed between 1887 and 1899 . When World War II ended the yard officially changed its name to the Naval Gun Factory, so the museum became the Naval Gun Factory Museum.
38.
In the foreground are 4719590 Trooper ( Tpr ) Ken Wilson ( left ) and 5715768 Tpr Laurie Sullivan ( right ) of B Squadron, 1st Armoured Regiment, Royal Australian Armoured Corps, discussing the breech mechanism of a . 30 machine gun mounted on Centurion tank callsign 24C which took part in the battle.
39.
It was designed to be light in weight, and would go on to be the standard 4-inch gun used on destroyers and submarines during WW I . The gun would use an A tube, full-length jacket, a muzzle swell with a side swing Smith-Asbury breech mechanism and Welin breech block.
40.
Breech loading, in its formal British ordnance sense, served to identify the gun as the type of RBL was retrospectively introduced to refer to the Armstrong breechloaders, which had a totally different breech mechanism, and since then the term BL has applied exclusively to the type of breechloader introduced from 1880 onwards using interrupted-screw breeches.
