Early cocoa-powder gun used on 1st class Protected Cruisers. Later used in coast defense batteries at Cromarty in 1913-1914.
Constructed of inner A tube/A tube/wire over rear half of A/jacket and B tube to 150 in ( cm) from muzzle/trunnion hoop over join jacket and B hoop. The breech bush screwed into the A tube and a collar between the A tube and the jacket screwed into the latter. The breech block was an interrupted screw cylindrical type with a hand worked continuous mechanism. The Mark VIII* indicated an alteration to the front slope to prevent slip back at high elevations, but no guns were so modified.
Actual bore length was 40.08 calibers. A total of six guns were made.
|Designation||9.2"/40 (23.4 cm) Mark VIII|
|Ship Class Used On||Powerful class|
|Date Of Design||about 1895|
|Date In Service||1897|
|Gun Weight||25 tons (26 mt)|
|Gun Length oa||384 in (9.754 m)|
|Bore Length||368.7 in (9.366 m)|
|Chamber Volume||4,600 in3 (75.4 dm3)|
|Rate Of Fire||about 2 rounds per minute|
|Projectile Types and Weights||CPC 2crh: 380 lbs. (172.4 kg)|
|Bursting Charge||CPC: 35.4 lbs. (16.1 kg)|
|Projectile Length||CPC 35.4 in (89.9 cm)|
|Propellant Charge||66 lbs. (29.9 kg) Cord 40+3.75
77.25 lbs. (35.0 kg) MD37
|Muzzle Velocity||2,329 fps (710 mps) [Cord propellant]|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||N/A|
|15 degrees||12,846 yards (11,745 m)|
Taken from range tables, but John Campbell calls this figure "optimistic."
- "Big Gun Monitors: The History of the Design, Construction and Operation of the Royal Navy's Monitors" by Ian Buxton
- "British Naval Guns 1880-1945 No 6" article by John Campbell in "Warship Volume VI"
- "World Warships in Review 1860-1906" by John Leather
- Article in Brasseys Naval Annual
Special help from George Gratz and Daniel Muir/p>
- 05 August 2006
- 31 January 2009
- Added construction details