Ordnance BLC 15 pounder

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Ordnance BLC 15 pounder
Type
Light field gun
Placeoforigin
United Kingdom
Service history
Inservice
1907 - 1918
Usedby
British Empire
Wars
First World War
Production history
Numberbuilt
536[1]
Specifications
Weight
Gun & breech 896pounds (406kg); Total 3,177pounds (1,441kg)[2]
Barrellength
Bore 84inches (2.134m)[2]
Shell
Shrapnel, HE 14pounds (6.35kg)
Calibre
3-inch (76.2mm)
Breech
single-motion interrupted screw
Recoil
hydro-spring, 40inches (1.02m)
Carriage
wheeled, box trail
Elevation
-9 - 16
Traverse
2 L & R
Muzzlevelocity
1,590feet per second (485m/s)
Maximumrange
5,750yards (5,260m)
The Ordnance BLC 15 pounder gun (BLC stood for BL Converted) was a modernised version of the obsolete BL 15 pounder 7 cwt gun, incorporating a recoil and recuperator mechanism above the barrel and modified quicker-opening breech. It was developed to provide Territorial Force artillery brigades with a reasonably modern field gun without incurring the expense of equipping them with the modern 18 pounder. It is the gun which writers usually mean by "15 pounder gun" in World War I.
Contents
1 History
2 Combat service
3 Ammunition
4 See also
5 Surviving examples
6 Notes
7 References
8 External links
//
History
Many modifications were made to the old 15 pounder barrels to adapt them to a new carriage with a recoil buffer and recuperator above the barrel similar to the 13 pounder design. Previously the barrels had been mounted directly on the carriage by trunnions. Now the barrel was suspended from a forged-steel inverted U-shaped cradle which had trunnions to attach it to the carriage. The trunnions, sight brackets and elevating gear attachment lugs were removed from the barrel. The radial T-vent hole on top was plugged, holes in the jacket passing through the trunnion centres were sealed with screwed steel plugs, and the holes in the hood for fitting tangent sights were plugged with white metal alloy.
The 3-motion breech was replaced by a single-motion interrupted screw breech which had an axial T vent running through it into the chamber, designed to take a T friction tube.
The new firing mechanism involved a new "push" type T friction tube which was inserted into the axial breech vent. The crosspiece of the T was positioned pointing upwards. A long layer's guard was added to the left side of the cradle projecting behind the breech. A spring-loaded firing handle was built into the layer's guard. When cocked by pulling back and then released, it sprang forward and struck a firing lever on the breech, which translated the forward motion to a downward motion and propelled a firing plunger into the T of the friction tube which in turn ignited the cordite propellant charge.
This section requires expansion.
Combat service

Camel Battery of BLC 15 pounders after capture of Hatum, 5 January 1918
The weapon was used by British Territorial Force and New Army, and Canadian, infantry divisions in all theatres of World War I until replaced by the 18 pounder from 1916 onwards.
10th Battery of the Royal Canadian Field Artillery (RCFA), equipped with 4 guns, fought a notable action in the evening of 22 April 1915 north of St Julien to hold the left of the British line where the German infantry was breaking through following their gas attack on the first day of the Second Battle of Ypres.[3] Hence when skillfully utilised in the role it was intended for - against troops in the open - the gun was still effective despite being obsolete. Where infantry avoided being caught in the open the guns were of limited use due to their light shell.
After they became redundant, from late 1916 some were retained in fixed positions on the Western Front as anti-tank guns, freeing up modern guns for their usual duties.[4]
Number 1 15 Pounder Camel Battery RGA (today's 21 (Air Assault) Battery) served with 6 guns with the Indian Expeditionary Force in the Aden hinterland from 1915 -1918, to defend the important port at Aden against any Turkish advance. In July 1915 actions were fought in initially losing and then regaining the British advanced post at Sheik Othman controlling the water supply to Aden.[5] Sgt Curtis was awarded the Distinguished Conduct Medal for saving his gun in these actions[6] (presumably the first, in which 2 guns were lost). The Camel Battery was present when the British captured Hatum in January 1918.
Ammunition



Cordite cartridge 15? oz, 1907
Cordite cartridge 1 lb 1 oz 11 dr, 1914
Mk VI Shrapnel shell
No. 65A Fuze
Mk V Case shot
Mk I high-explosive shell, 1915, with No. 101 fuze. Photo...(and so on)

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