BL 2.75-inch Mountain Gun

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Ordnance BL 2.75 inch mountain gun
2.75inchMountainGunKamberliSalonikaFrontJune1918.jpg
Men of the 4th (Highland) Mountain Brigade with 2.75-inch (70 mm) mountain gun, Kamberli, Salonika front, June 1918.
Type Mountain artillery
Place of origin United Kingdom United Kingdom
India India
Service history
In service 1914–1919
Used by United Kingdom United Kingdom
 India India
Wars World War I
Production history
Number built 183
Specifications
Weight 586 kg (1,292 lb)
Barrel length 72.5 inch (1.84 m)

Shell Separate loading Breech Loading 5.67 kg (12.5 lb)[1]
Caliber 2.75-inch (70 mm)[1]
Recoil Hydro-spring, constant, 38 inches (970 mm)
Carriage Wheeled,single pole trail
Elevation -15° - 22°[1]
Traverse 4° L & R[1]
Muzzle velocity 1,290 ft/s (393 m/s)[1]
Maximum firing range (shrapnel) 5,600 yds
(5,120 m)
(HE) 5,800 yds (5,303 m) [1]

The Ordnance BL 2.75 inch Mountain Gun was a screw gun designed for and used by the Indian Mountain Artillery into World War I.

Description[edit]

The gun was an improved version of the 1901 BL 10 pounder Mountain Gun.

The new 1911 version improved on the 1901 gun with a new pole trail, recoil buffer, recuperator and gunshield, and increased shell weight from 10 to 12.5 lb (5.7 kg). It was a screw gun design, where the barrel could be separated into two parts via a screw joint. This allowed for the gun to have a heavier barrel, but still be broken into smaller portions for transport by mule teams. This was important for a weapon designed to be used in mountainous and rough terrain, or where adequate vehicle and horse transport was not readily available. The weapon could be carried by 6 mules or towed.

Service history[edit]

Firing on the Doiran front, Salonika 1917

The gun was adopted in 1911 and began entering service in 1914.

The weapon served primarily with the Indian Mountain Artillery in the northwest portion of British Indian territory (on what is now the border between Pakistan and Afghanistan) and participated in British-led military action in that theatre.

It also served in Mesopotamia and the Salonika front during World War I.

Due to its specialised nature the gun was produced in only limited numbers, with just 183 manufactured during the war.[2]

It was superseded at the end of World War I by the QF 3.7-inch mountain howitzer.

Ammunition[edit]

BL2.75inchCartridgeDiagram.jpg
BL2.75inchShrapnelMkIShellDiagram.jpg
No80FuzeMkVL.jpg
TFrictionTubeMkIV.jpg
Cordite cartridge
Mk I Shrapnel shell
No. 80 fuze
T friction tube

Surviving Examples[edit]

2.75 inch Mountain Gun on display at the Heugh Battery
Front view

A 2.75 inch Mountain Gun is on display at the Heugh Battery Museum, Hartlepool

See also[edit]

Notes and references[edit]

  1. ^ a b c d e f Hogg & Thurston 1972, page 42
  2. ^ "Camel artillery ready to fire". New Zealand History. Ministry for Culture and Heritage. 15 July 2013. Retrieved 2 January 2014. 

Bibliography[edit]

External links[edit]