barbette, marks IV, V, Va, Vb, VI, VIa land service, 1923 at State Library of Victoria Handbook of the 9 2-inch B.L. Guns, Mark ix "C" Mark ix, and Marks x,x, and x. 1912 at State Library of Victoria History of Apostle Battery Video of Gun 3 of the De Waal Battery on Robben Island More video of Gun 3 of the De Waal Battery on Robben Island Naval guns of the United Kingdom World War I naval weapons of the United Kingdom Coastal artillery 234 mm artillery