RML 13 pounder 8 cwt

RML 13 pounder 8 cwt gun
RML 13 pounder 8 cwt Field Gun diagram, 1882
Type	Field gun
Place of origin	United Kingdom
Service history
In service	1879 - 1902
Used by	British Empire
Production history
Designer	Woolwich Arsenal
Manufacturer	Woolwich Arsenal
Produced	1879-
Variants	13 pdr 8 cwt Mark I and II (Land Service) only
Specifications
Weight	8-long-hundredweight (400 kg)
Length	7 ft 3 ins
Crew	9
Shell	13 pounds (5.9 kg) (common shell) 13 pounds (5.9 kg) (shrapnel)
Action	RML
Breech	none – muzzle-loading
Carriage	Horse drawn
Rate of fire	One round per minute
Muzzle velocity	1,330 feet per second (405 m/s)
Effective firing range	3,500 yards (3,200 m)
Sights	Centre sighted

The RML 13 pounder 8 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 13 pounds (5.9 kg). "8 cwt" refers to the weight of the gun.

The 13 pounder was the last Rifled Muzzle Loading field gun to be produced, with production starting in 1879. Unlike the 9 and 16 Pounder RML guns, the 13 pounder had a much greater muzzle length. They could be finished as muzzle loaders or breech loaders, however they were all ordered to be finished as muzzle loaders. Their construction consisted of an 'A' tube of toughened steel, over which was shrunk a 'B' tube of wrought iron. The gun was rifled using a polygroove system, comprising 10 grooves on the Maitland system.

The gun was fitted with a set of sights on the centre of the barrel. This enabled the gun to be sighted for indirect, or direct fire. 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 13 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. When deployed as Field Artillery it was designed to move at the same speed as infantry, or when deployed as 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 13 pounder saw action in the Anglo-Egyptian War of 1882, where four Batteries were deployed, two with the Royal Horse Artillery and two as Field Artillery. It remained in front-line service with the Royal Artillery until the late 1880s when replaced by the 15 pounder Breech-Loading gun.