|RML 64 pounder 64 cwt gun|
Fortification mounted MK III gun firing at Fort Glanville Conservation Park, South Australia
|Place of origin||United Kingdom|
|In service||1865 - 190?|
|Used by||British Empire|
Elswick Ordnance Company
|Variants||Mk I, II, III|
|Weight||64-long-hundredweight (3,300 kg)|
|Length||9 ft 10 inches|
|Barrel length||97.5 inches bore|
|Shell||64 pounds (29 kg)|
|Calibre||6.3 inches (160 mm)|
|Breech||none - muzzle loading|
|Muzzle velocity||wrought-iron tube : 1,252 feet per second (382 m/s)|
Mk III steel tube : 1,390 feet per second (420 m/s)
|Effective range||5,000 yards (4,600 m)|
The RML 64 pounder 64 cwt gun was a Rifled, Muzzle Loading (RML) naval, field or fortification artillery gun manufactured in England in the 19th century, which fired a projectile weighing approximately 64 pounds (29 kg). "64 cwt" refers to the gun's weight rounded up to differentiate it from other "64-pounder" guns : 1 hundredweight (cwt) = 112 pounds.
The calibre of 6.3 inches was chosen to enable it to fire remaining stocks of spherical shells originally made for the obsolete 32 pounder guns if necessary.
Mark I (adopted in 1864) and Mark II (adopted 1866) guns, and Mark III guns made from 1867 - April 1871 had wrought-iron inner "A" tubes surrounded by wrought-iron coils.
Mark III guns made after April 1871 were built with toughened mild steel "A" tubes, and earlier Mark III guns were re-tubed with steel and were classified as a siege gun in land service. Remaining guns with iron tubes were used for sea service.
Rifling of all guns consisted of 3 grooves, with a uniform twist of 1 turn in 40 calibres (i.e. 1 turn in 252 inches).
The gun's standard shell was "common shell", for firing on troops in cover, ships and buildings, weighed 57.4 pounds (26.0 kg) when empty with a bursting charge of 7.1 pounds (3.2 kg). Shrapnel shells could also be fired; a 66.6 pounds (30.2 kg) shell with a 9-ounce (260 g) bursting charge propelling 234 metal balls.
- Mk I, Mk II and Mk III guns at Fort George, near Inverness, Scotland, UK
- At Nothe Fort, Weymouth, UK
- A Mk III gun at Fort Brockhurst, Gosport, UK
- On board HMS Gannet, Chatham Dockyard, UK
- At Pendennis Castle, Cornwall, UK
- At Fort Glanville, Adelaide, South Australia
- Mk III gun no. 739 of 1878 at Townsville, Queensland, Australia
- Two guns at Fort Lytton, Brisbane, Australia
- Lei Yue Mun Fort's Central Battery, Hong Kong
- 6 guns at Fort Siloso, Singapore. See also Mk III gun No. 767 of 1874
- RML 64-pr 64 cwt Mk 3 at Albert Park, Auckland, Auckland, New Zealand
- RML 64 pounder 58 cwt gun : conversion of SBML 32 pounder 58 cwt gun
- RML 64 pounder 71 cwt gun : conversion of SBML 8 inch 65 cwt gun
Notes and references
- A Guide to Fort Glanville, South Australia. Semaphore Park, South Australia: The Fort Glanville historical association. 2000.
- 1,252 feet/second firing a 64-pound projectile with 8 pounds R.L.G. gunpowder is quoted for wrought-iron tubed guns in "Treatise on Construction and Manufacture of Service Ordnance, 1879", page 363. 1,390 feet/second firing a 65-pound projectile using 10 pounds R.L.G.4 gunpowder is quoted for Mk III steel tube gun in Table XII in "Text Book of Gunnery 1902".
- Treatise on Construction and Manufacture of Service Ordnance, 1879, pages 292, 261-265
- "The 64pr. 64 cwt gun Mark III". Palmerston Forts Society, Fareham Hampshire U.K. http://www.palmerstonforts.org.uk/pav1/pend.htm. Retrieved 2009-01-20.
- Treatise on the Construction and Manufacture of Ordnance in the British Service. War Office, UK, 1879
- Text Book of Gunnery, 1902. LONDON : PRINTED FOR HIS MAJESTY'S STATIONERY OFFICE, BY HARRISON AND SONS, ST. MARTIN'S LANE
|Wikimedia Commons has media related to RML 64 pounder 64 cwt Gun.|
- Diagram of gun on 6 foot parapet platform mounting at Victorian Forts website
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