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
Service history
In service1914–1919
Used by United Kingdom of Great Britain and Ireland
British Raj
Wars World War I
Production history
Designed1911
No. built183
Specifications
Mass586 kg (1,292 lb)
Barrel  length72.5 inch (1.84 m)

Shell BL (bagged charge)
Shell weight5.67 kg (12.5 lb) [1]
Caliber 2.75-inch (70 mm) [1]
Breech Interrupted screw
Recoil Hydro-spring, constant,
38 in (970 mm)
CarriageTwo wheeled, pole trail
Elevation -15° - 22° [1]
Traverse 4° L & R [1]
Muzzle velocity 1,290 ft/s (393 m/s) [1]
Maximum firing range5,600 yd (5,100 m) Shrapnel
5,800 yd (5,300 m) HE [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.

Contents

Description

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 gun shield, 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 six mules or towed.

Service history

Firing on the Doiran front, Salonika 1917 2.75inchMountainGunDoiranFront1917.jpg
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It was superseded at the end of World War I by the QF 3.7-inch mountain howitzer.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

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

Surviving examples

2.75-inch mountain gun on display at the Heugh Battery 2.75 inch Mountain Gun.jpg
2.75-inch mountain gun on display at the Heugh Battery
Front view Front view of the 2.75 inch Mountain Gun.jpg
Front view

A 2.75-inch mountain gun is on display at the Heugh Battery Museum, Hartlepool

See also

Notes and references

  1. 1 2 3 4 5 6 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

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