| | | | | | | | | | | | | | “Iron Duke” Class (4) | 1911–12 | 25,000 | 21.0 | 4,300 | 10, 13″.5 | 4 | 12″ | 9″ and 8″ | 4″ | 4″ | 6″ | 11″ | 1½″ to 2½″ | Ditto | | | | | 12, 6″ | | | | | | | | | | | | | | | | | | | | | | | “King George V.” Class (3) | 1910–11 | 23,000 | 21.0 | 4,000 | 10, 13″.5 | 2 | 12″ | 9″ and 8″ | 4″ | 2½″ | nil | 11″ | 1½″ to 4″ | Side armoured up | | | | | 12, 4″ | | | | | | | | | to upper deck. | | | | | | | | | | | | | | “Orion” Class (4) | 1909–10 | 22,500 | 21.0 | 4,100 | 10, 13″.5 | 2 | 12″ | 9″ and 8″ | 4″ | 2½″ | nil | 11″ | 1½″ to 4″ | Ditto | | | | | 13, 4″ | | | | | | | | | | | | | | | | | | | | | | | _Canada_ | Emergency | 28,000 | 22.75 | 3,800 | 10, 14″ | 4 | 9″ | 7″ and 4½″ | 4″ | 4″ | 6″ | 10″ | 1½″ to 4″ | Side armoured up | War | | | | 12, 6″ | | | | | | | | | to upper deck and | Programme | | | | | | | | | | | | | secondary battery | | | | | | | | | | | | | | above that. | | | | | | | | | | | | | | _Erin_ | Ditto | 23,000 | 21.0 | 2,800 | 10, 13″.5 | 3 | 12″ | 9″ and 8″ | 4″ | 4″ | 5″ | 11″ | 1½″ to 3″ | Ditto