THE GREAT WAR 1914-1918
AUSTRALIAN IMPERIAL FORCE
Stokes Mortar and Crew
The Stokes mortar was a British trench mortar invented
by Sir Wilfred Stokes KBE that was issued to the British,
Commonwealth and U.S. armies,
as well as the Portuguese Expeditionary Corps (CEP),
during the later half of the First World War.
The 3-inch trench mortar is a smooth-bore,
muzzle-loading weapon for high angles of fire.
The Stokes mortar was a simple weapon,
consisting of a smoothbore metal tube fixed to a base plate
(to absorb recoil) with a lightweight bipod mount.
When a mortar bomb was dropped into the tube,
an impact sensitive primer in the base of the bomb would make contact
with a firing pin at the base of the tube,
firing the bomb towards the target.
The barrel is a seamless drawn-steel tube necked down at the breech or base end.
To the breech end is fitted a base cap,
within which is secured a firing pin protruding into the barrel.
The caps at each end of the bomb cylinder were 81 mm diameter.
The bomb was fitted with a modified
hand grenade fuze on the front,
with a perforated tube containing a propellant
charge and an impact-sensitive cap at the rear.
Range was determined by the amount of propellant charge used
and the angle of the barrel.
A basic propellant cartridge was used for all firing,
and covered short ranges.
Up to four additional
"rings" of propellant were used for incrementally greater ranges.
See range tables below.
The four rings were supplied with the cartridge
and gunners discarded the rings which were not needed.
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