Appendix J - Details of 6-in B.L. Gun. Whist this data relates to a Mark V gun, I felt it appropriate to include it whist I research data relating to the 6-inch Mark VII B.L. guns installed at the Penarth Head Fort and Coastal Battery. The 100 lbs. (45.5 Kg) projectile was was also confirmed within a newspaper report of the test trials at Penarth Head during November 1903. [499] [1119]

Ordnance, Breech Loading, 6-Inch, Wire, Mark VII -  General Arrangement of Breech Mechanism. The B.L. 6-inch gun Mark VII was a British naval gun dating from 1899 emanating from Vickers, Sons and Maxim. There was a variety of versions, the most common of which was mounted on a heavy travelling carriage in 1915 for British Army service to become one of the main heavy field guns utilised during WWI. It was, however, adapted with a variety of mounting options, and thus, became a common coastal defence gun used throughout the British Empire during the first half of the twentieth century. - Handbook of the 6-Inch B.L. Guns Mark VII (Land Service) [1120] 1911. [1121]

The Wire-Wound Gun. 'The wire is wound in layers around an inner tube of steel. Each layer is wound with a different tension of the wire, and each, layer exerts a compression on the layers which are inside of it. The result is that when completed the outer layers are in extension, gradually diminishing to the inner layers, which are in compression ; all within the elastic limit. As wire can be made of enormous strength (as much as 200,000 pounds per square inch tensile strength), this type of gun is the strongest for the same weight of any yet developed.' - Handbook of the 6-Inch B.L. Guns Mark VII (Land Service) [1120] 1911. [1121]