40 Pounder Armstrong Gun

The Breech Loading Rifled 40 Pounder 35 cwt (hundred weight) gun was used in Canada in mobile heavy and coast defence roles.

Introduced in 1859 as a naval gun, the BLR 40 Pdr was also known as the 40 Pounder Armstrong Gun because of the Armstrong screw breech mechanism. Originally manufactured with a 32 cwt barrel, an improved 35 cwt was introduced as production continued.

The example on exhibit was made in 1871. The Armstrong screw breech was not a completely successful design, causing a reversion to muzzle loading in later heavy designs until a satisfactory breech mechanism could be developed.

Projectile: 40 pounds (18.2 kilograms)
Range: 5,197 yards (4,752 metres)
Detachment: Gun, limber, ammunition wagon, 18 horses and 9 gunners