32-pounder smoothbore cannon
32-pounder cannon outside the Underwater Archaeology Centre at Fort Victoria.
TypeNaval gun
Coast Defence gun
Place of origin United Kingdom
Service history
In service1847 - 1908
Used byUnited Kingdom
WarsCrimean War
Production history
Produced1847 - approximately 1860
Specifications (for the 32-pounder of 58 cwt)
Mass58 cwt
Barrel length9 feet 6 inches (2.896 m)

ShellSolid Shot
Shell weight32 pounds (14.51 kg)
Calibre6.375 inches (16.19 cm)
Muzzle velocity1,900 feet per second (580 m/s)
Effective firing rangeApproximately 3,000 yards (2,700 m)
Maximum firing range3,620 yards (3,310 m)

The 32-pounder was a spcification of artillery pieces designed and used by the British Armed Forces in the mid-19th century. The cannons were smoothbore muzzle-loading weapons capable of firing a projectile of 32 lb (15 kg). It was introduced in 1847 and used by the Royal Artillery on land and the Royal Navy at sea.

Design

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A muzzle-loaded cannon: 1) projectile (shot), 2) powder charge, 3) vent

32-pounders were a traditional design of muzzleloader, in that they needed to be loaded from the end of the barrel.[1] Before it could be loaded the bore of the barrel was cleaned with a sponge after which an explosive charge (gunpowder in a cloth bag) was rammed down into the breech, followed by a projectile.[1] The gun was primed (using a metal spike inserted through the vent that pierced the charge), and fired using a percussion cap (which detonated the charge and forced the projectile out of the barrel).[2]

There were 16 different types of 32-pounder introduced into service, from small 25 cwt with 5 ft 4 in (1.63 m) barrels, up to larger 58 cwt pieces with barrels of 9 ft 7 in (2.92 m). The 58 cwt model was the most common variant of 32-pounder cannon used in land service by the Royal Artillery. It's barrel was 9 ft 7 in (2.92 m) long and had a calibre of 6.375 in (16.19 cm)[3] With a 10 lb (4.5 kg) powder charge (the maximum charge the barrel could withstand, although smaller charges could be used) it fired a projectile with a muzzle velocity of 1,900 feet per second (580 m/s).[4]

Service

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Conversion to rifled muzzle loader

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The introduction of rifled muzzle loading cannon (also referred to as RMLs) rendered smoothbore guns obsolete.[5] However smoothbores still existed in large numbers and various attempts were made to adapt the guns to fire new projectiles.[6][5] Eventually Captain William Palliser patented a method of boring out the gun barrel and inserting a wrought iron rifled liner.[5] This allowed rifled shot to be fired from old smoothbore cannon and experiments revealed that it made them even more powerful than they had been before.[7] The 32-pounders converted in this way were classed as 32-pounder RML 58 cwt or 64-pounder RML 58 cwt. They had a calibre of 6.3 inches (16 cm) and a muzzle velocity of 1,245 ft/s (379 m/s).[4] Introduced in 1870, they remained in service until they were declared obsolete in 1908.[8]

References

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  1. ^ a b Cantwell, p. 21
  2. ^ Cantwell, p. 28
  3. ^ Hogg, p. 247
  4. ^ a b Fletcher, p. 94
  5. ^ a b c Hogg, p.39
  6. ^ Hogg, p. 37
  7. ^ Hogg, p. 40
  8. ^ Hogg, p. 248

Bibliography

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  • Cantwell, Anthony (1985). Fort Victoria: 1852–1969. Isle of Wight County Council Cultural Services. ISBN 0906328322.
  • Owen, John Fletcher (1879). Treatise on Construction of Service Ordnance 1879.
  • Hogg, Ian (1974). Coast Defences of England and Wales, 1856 – 1956. Vancouver: David & Charles. ISBN 0-7153-6353-0.