RML 16 pounder 12 cwt

RML 16 pounder 12 cwt gun
Gun on Mark II carriage
Type	Field gun
Place of origin	United Kingdom
Service history
In service	1871 - 1908
Used by	British Empire
Production history
Designer	Woolwich Arsenal
Manufacturer	Woolwich Arsenal
Variants	16 pdr 12 cwt Mark I (Land Service) only
Specifications
Weight	12-long-hundredweight (600 kg)
Crew	9
Shell	16 pounds (7.3 kg) (common shell) 16 pounds (7.3 kg) (shrapnel)
Action	RML
Breech	none – muzzle-loading
Muzzle velocity	1,330 feet per second (405 m/s)
Effective firing range	3,500 yards (3,200 m)

The RML 16 pounder 12 cwt gun was a British Rifled, Muzzle Loading (RML) field artillery gun manufactured in England in the 19th century, which fired a projectile weighing approximately 16 pounds (7.3 kg). "12 cwt" refers to the weight of the gun.

The gun consisted of an 'A' tube of toughened steel, over which was shrunk a 'B' tube of wrought iron. The gun was rifled using the system developed by William Palliser, in which studs protruding from the side of the shell engaged with three spiral grooves in the barrel.

The gun was fitted with a set of side sights on each side of the barrel. This enabled the gun to be sighted for indirect, or direct fire, from either side of the gun. A flat surface was machined on top of the barrel for a clinometer to be used, enabling the gun to be levelled, or to provide an alternate method of indirect sighting.

The 16 pounder was normally deployed in batteries of six or four guns. Each gun was pulled by a team of six horses. It had a crew of nine men – five crew who could be mounted on seats on the limber and gun, three drivers and a gun commander (number one) mounted separately.

In addition to each gun, a limbered ammunition trailer was also horse drawn. Field Artillery was designed to move at the same speed as infantry, with Horse Artillery being used where greater speed was required.

Guns were fired using a silk bag containing a black powder propellant. They used three types of ammunition – Common shell (for use against buildings or fortifications), shrapnel shell (for use any Infantry or Cavalry) and case shot (for close range use against 'soft' targets. Ignition was through a copper lined vent at the breech end of the gun. A copper friction tube would be inserted and a lanyard attached. When the lanyard was pulled the tube would ignite, firing the gun. A number of different fuzes could be used enabling shells to either burst at a pre-determined time (and range), or on impact. A typical rate of fire was one round per minute.

The 16 pounder 12 cwt Rifled Muzzle Loader was the field gun selected by the Royal Artillery in 1871 to replace the more sophisticated RBL 12 pounder 8 cwt Armstrong gun, which had acquired a reputation for unreliability.