magazine n.22, July 1995. Handbook for RML 17.72 inch gun, 1887, HMSO publications. Hughes, Q., Malta: A Guide to the Fortifications and Britain in the Mediterranean: the defense of her Naval stations Schull, Lieut. Herman W. (1901) "Spanish Ordnance in the Defense of Havana". Journal of the United States Artillery, Vol. 15, No. 2, Whole No. 48, pp. 129–146. External links NJM Campbell, BRITISH SUPER-HEAVY GUNS photo of 100-ton gun automatic gas-check @ BBC website (accessed 2016-09-03) Animation of firing cycle Artillery of the United Kingdom Victorian-era weapons of the United Kingdom Coastal artillery 450 mm artillery Naval guns of Italy Elswick Ordnance Company